tree-wide: drop pointless zero initialization (#16884)

tree-wide: drop pointless zero initialization

src/basic/smack-util.c

@@ -106,7 +106,7 @@ int mac_smack_apply_fd(int fd, SmackAttr attr, const char *label) {
 
 int mac_smack_apply_pid(pid_t pid, const char *label) {
         const char *p;
-        int r = 0;
+        int r;
 
         assert(label);
 
@@ -232,7 +232,7 @@ int mac_smack_fix_container(const char *path, const char *inside_path, LabelFixF
 }
 
 int mac_smack_copy(const char *dest, const char *src) {
-        int r = 0;
+        int r;
         _cleanup_free_ char *label = NULL;
 
         assert(dest);