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

tree-wide: drop pointless zero initialization

src/core/dbus-job.c

@@ -340,7 +340,7 @@ static int bus_job_allocate_bus_track(Job *j) {
 }
 
 int bus_job_coldplug_bus_track(Job *j) {
-        int r = 0;
+        int r;
         _cleanup_strv_free_ char **deserialized_clients = NULL;
 
         assert(j);

src/core/dbus.c

@@ -1149,7 +1149,7 @@ void bus_track_serialize(sd_bus_track *t, FILE *f, const char *prefix) {
 }
 
 int bus_track_coldplug(Manager *m, sd_bus_track **t, bool recursive, char **l) {
-        int r = 0;
+        int r;
 
         assert(m);
         assert(t);

src/core/swap.c

@@ -1425,7 +1425,7 @@ int swap_process_device_new(Manager *m, sd_device *dev) {
         _cleanup_free_ char *e = NULL;
         const char *dn, *devlink;
         Unit *u;
-        int r = 0;
+        int r;
 
         assert(m);
         assert(dev);
@@ -1463,7 +1463,7 @@ int swap_process_device_new(Manager *m, sd_device *dev) {
 
 int swap_process_device_remove(Manager *m, sd_device *dev) {
         const char *dn;
-        int r = 0;
+        int r;
         Swap *s;
 
         r = sd_device_get_devname(dev, &dn);