macosx: don't try to resume playback if file was moved or deleted (close #11644)

(cherry picked from commit 1de25564be9e214b73da76e1f7ebda6047c90413)

modules/gui/macosx/playlist.m

@@ -1493,9 +1493,16 @@
         }
 
         char *psz_url = decode_URI(input_item_GetURI(p_item));
+        if (!psz_url)
+            return;
+
         NSString *url = [NSString stringWithUTF8String:psz_url ? psz_url : ""];
         free(psz_url);
 
+        /* check for file existance before resuming */
+        if (![[NSFileManager defaultManager] fileExistsAtPath:[[NSURL URLWithString:[NSString stringWithUTF8String:input_item_GetURI(p_item)]] path]])
+            return;
+
         NSNumber *lastPosition = [recentlyPlayedFiles objectForKey:url];
         if (lastPosition && lastPosition.intValue > 0) {
             vlc_value_t pos;