diff --git a/src/basic/process-util.c b/src/basic/process-util.c
index 001002a55e..6cf882866f 100644
--- a/src/basic/process-util.c
+++ b/src/basic/process-util.c
@@ -1095,7 +1095,7 @@ pid_t getpid_cached(void) {
          * https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c579f48edba88380635ab98cb612030e3ed8691e
          */
 
-        __atomic_compare_exchange_n(
+        (void) __atomic_compare_exchange_n(
                         &cached_pid,
                         &current_value,
                         CACHED_PID_BUSY,
diff --git a/src/basic/virt.c b/src/basic/virt.c
index 79fa43e0d8..1fef114bc8 100644
--- a/src/basic/virt.c
+++ b/src/basic/virt.c
@@ -492,8 +492,6 @@ Virtualization detect_vm(void) {
                         return xen_dom0;
                 if (xen_dom0 == 0)
                         goto finish;
-
-                v = VIRTUALIZATION_NONE;
         } else if (v != VIRTUALIZATION_NONE)
                 assert_not_reached();
 
diff --git a/src/core/unit.c b/src/core/unit.c
index 5904c9f4b5..6792bda9d0 100644
--- a/src/core/unit.c
+++ b/src/core/unit.c
@@ -2880,9 +2880,7 @@ int unit_watch_pid(Unit *u, pid_t pid, bool exclusive) {
                                 if (array[n] == u)
                                         found = true;
 
-                if (found) /* Found it already? if so, do nothing */
-                        r = 0;
-                else {
+                if (!found) {
                         Unit **new_array;
 
                         /* Allocate a new array */
diff --git a/src/libsystemd/sd-device/sd-device.c b/src/libsystemd/sd-device/sd-device.c
index 2c7b97ab4d..af39c984d0 100644
--- a/src/libsystemd/sd-device/sd-device.c
+++ b/src/libsystemd/sd-device/sd-device.c
@@ -1013,7 +1013,7 @@ _public_ sd_device *sd_device_get_child_next(sd_device *device, const char **ret
 
         assert(device);
 
-        hashmap_iterate(device->children, &device->children_iterator, (void**) &child, (const void**) ret_suffix);
+        (void) hashmap_iterate(device->children, &device->children_iterator, (void**) &child, (const void**) ret_suffix);
         return child;
 }
 
diff --git a/src/libsystemd/sd-journal/test-mmap-cache.c b/src/libsystemd/sd-journal/test-mmap-cache.c
index e3dfbada32..bc063381b2 100644
--- a/src/libsystemd/sd-journal/test-mmap-cache.c
+++ b/src/libsystemd/sd-journal/test-mmap-cache.c
@@ -21,17 +21,17 @@ int main(int argc, char *argv[]) {
 
         x = mkostemp_safe(px);
         assert_se(x >= 0);
-        unlink(px);
+        (void) unlink(px);
 
         assert_se(fx = mmap_cache_add_fd(m, x, PROT_READ));
 
         y = mkostemp_safe(py);
         assert_se(y >= 0);
-        unlink(py);
+        (void) unlink(py);
 
         z = mkostemp_safe(pz);
         assert_se(z >= 0);
-        unlink(pz);
+        (void) unlink(pz);
 
         r = mmap_cache_fd_get(fx, 0, false, 1, 2, NULL, &p);
         assert_se(r >= 0);
diff --git a/src/test/test-execute.c b/src/test/test-execute.c
index 164c1bc033..27d2af78f3 100644
--- a/src/test/test-execute.c
+++ b/src/test/test-execute.c
@@ -419,7 +419,7 @@ static void test_exec_privatetmp(Manager *m) {
         test(m, "exec-privatetmp-no.service", 0, CLD_EXITED);
         test(m, "exec-privatetmp-disabled-by-prefix.service", can_unshare ? 0 : MANAGER_IS_SYSTEM(m) ? EXIT_FAILURE : EXIT_NAMESPACE, CLD_EXITED);
 
-        unlink("/tmp/test-exec_privatetmp");
+        (void) unlink("/tmp/test-exec_privatetmp");
 }
 
 static void test_exec_privatedevices(Manager *m) {
diff --git a/src/test/test-io-util.c b/src/test/test-io-util.c
index fd41a2a4d1..fa3ef865c9 100644
--- a/src/test/test-io-util.c
+++ b/src/test/test-io-util.c
@@ -37,7 +37,7 @@ TEST(sparse_write) {
 
         fd = mkostemp(fn, O_CLOEXEC);
         assert_se(fd >= 0);
-        unlink(fn);
+        (void) unlink(fn);
 
         test_sparse_write_one(fd, test_a, sizeof(test_a));
         test_sparse_write_one(fd, test_b, sizeof(test_b));
diff --git a/src/test/test-watchdog.c b/src/test/test-watchdog.c
index a0b3af2aba..70d069c08b 100644
--- a/src/test/test-watchdog.c
+++ b/src/test/test-watchdog.c
@@ -23,8 +23,6 @@ int main(int argc, char *argv[]) {
         r = watchdog_setup(t);
         if (r < 0)
                 log_warning_errno(r, "Failed to open watchdog: %m");
-        if (r == -EPERM)
-                t = 0;
 
         for (i = 0; i < count; i++) {
                 t = watchdog_runtime_wait();
diff --git a/src/udev/udev-watch.c b/src/udev/udev-watch.c
index d00226cd7a..58c82794f0 100644
--- a/src/udev/udev-watch.c
+++ b/src/udev/udev-watch.c
@@ -51,7 +51,7 @@ int udev_watch_restore(int inotify_fd) {
 
         assert(inotify_fd >= 0);
 
-        rm_rf("/run/udev/watch.old", REMOVE_ROOT);
+        (void) rm_rf("/run/udev/watch.old", REMOVE_ROOT);
 
         if (rename("/run/udev/watch", "/run/udev/watch.old") < 0) {
                 if (errno == ENOENT)