Two fixlets (#41273)

From yeswehack.com reports

src/core/execute-serialize.c

@@ -3113,9 +3113,11 @@ static int exec_context_deserialize(ExecContext *c, FILE *f) {
                         if (!GREEDY_REALLOC(c->log_extra_fields, c->n_log_extra_fields + 1))
                                 return log_oom_debug();
 
-                        c->log_extra_fields[c->n_log_extra_fields++].iov_base = strdup(val);
-                        if (!c->log_extra_fields[c->n_log_extra_fields-1].iov_base)
+                        char *field = strdup(val);
+                        if (!field)
                                 return log_oom_debug();
+
+                        c->log_extra_fields[c->n_log_extra_fields++] = IOVEC_MAKE_STRING(field);
                 } else if ((val = startswith(l, "exec-context-log-namespace="))) {
                         r = free_and_strdup(&c->log_namespace, val);
                         if (r < 0)

src/mountfsd/mountwork.c

@@ -521,7 +521,7 @@ static int vl_method_mount_image(
 
         r = loop_device_make(
                         image_fd,
-                        p.read_only == 0 ? O_RDONLY : O_RDWR,
+                        p.read_only > 0 ? O_RDONLY : O_RDWR,
                         0,
                         UINT64_MAX,
                         UINT32_MAX,
@@ -532,7 +532,7 @@ static int vl_method_mount_image(
                 return r;
 
         DissectImageFlags dissect_flags =
-                (p.read_only == 0 ? DISSECT_IMAGE_READ_ONLY : 0) |
+                (p.read_only > 0 ? DISSECT_IMAGE_READ_ONLY : 0) |
                 (p.growfs != 0 ? DISSECT_IMAGE_GROWFS : 0) |
                 DISSECT_IMAGE_DISCARD_ANY |
                 DISSECT_IMAGE_FSCK |