tree-wide: assorted Coccinelle fixes

It's that time of year again.

src/shared/dissect-image.c

@@ -1596,7 +1596,7 @@ int dissect_image(
                         }
 
                         if (m->verity_ready)
-                                m->verity_sig_ready = !!verity->root_hash_sig;
+                                m->verity_sig_ready = verity->root_hash_sig;
 
                 } else if (m->partitions[verity->designator == PARTITION_USR ? PARTITION_USR_VERITY_SIG : PARTITION_ROOT_VERITY_SIG].found) {
 

src/shared/exec-util.c

@@ -529,7 +529,7 @@ int fork_agent(const char *name, int except[], size_t n_except, pid_t *ret_pid,
                  * stdin around. */
                 fd = open("/dev/tty", O_WRONLY);
                 if (fd < 0) {
-                        if (errno != -ENXIO) {
+                        if (errno != ENXIO) {
                                 log_error_errno(errno, "Failed to open /dev/tty: %m");
                                 _exit(EXIT_FAILURE);
                         }

src/shared/pkcs11-util.c

@@ -219,9 +219,9 @@ int pkcs11_token_login_by_pin(
                 return log_error_errno(SYNTHETIC_ERRNO(EIO),
                                        "Failed to log into security token '%s': %s", token_label, p11_kit_strerror(rv));
 
-        log_notice("PIN for token '%s' is incorrect, please try again.", token_label);
-
-        return -ENOLCK;
+        return log_notice_errno(SYNTHETIC_ERRNO(ENOLCK),
+                                "PIN for token '%s' is incorrect, please try again.",
+                                token_label);
 }
 
 int pkcs11_token_login(