macosx: always delete stored input thread on change (close #14850)

modules/gui/macosx/intf.m

@@ -1320,9 +1320,7 @@ static VLCMain *_o_sharedMainInstance = nil;
 // This must be called on main thread
 - (void)PlaylistItemChanged
 {
-    input_thread_t *p_input_changed = NULL;
-
-    if (p_current_input && p_current_input->b_dead) {
+    if (p_current_input) {
         var_DelCallback(p_current_input, "intf-event", InputEvent, [VLCMain sharedInstance]);
         vlc_object_release(p_current_input);
         p_current_input = NULL;
@@ -1332,7 +1330,9 @@ static VLCMain *_o_sharedMainInstance = nil;
         [[NSNotificationCenter defaultCenter] postNotificationName:VLCInputChangedNotification
                                                             object:nil];
     }
-    else if (!p_current_input) {
+
+    input_thread_t *p_input_changed = NULL;
+
     // object is hold here and released then it is dead
     p_current_input = playlist_CurrentInput(pl_Get(VLCIntf));
     if (p_current_input) {
@@ -1353,7 +1353,6 @@ static VLCMain *_o_sharedMainInstance = nil;
         [[NSNotificationCenter defaultCenter] postNotificationName:VLCInputChangedNotification
                                                             object:nil];
     }
-    }
 
     [self updateMetaAndInfo];