Fixed a check on malloc failure in libvlc_media_get_tracks_info().

(cherry picked from commit ca1bdb86)
Signed-off-by: Rémi Duraffort <ivoire@videolan.org>

src/control/media.c

@@ -691,7 +691,7 @@ libvlc_media_get_tracks_info( libvlc_media_t *p_md, libvlc_media_track_info_t **
     const int i_es = p_input_item->i_es;
     *pp_es = (i_es > 0) ? malloc( i_es * sizeof(libvlc_media_track_info_t) ) : NULL;
 
-    if( !pp_es ) /* no ES, or OOM */
+    if( !*pp_es ) /* no ES, or OOM */
     {
         vlc_mutex_unlock( &p_input_item->lock );
         return 0;