Fixed a small leak when the rar stream_filter recognize the stream.

(cherry picked from commit 5ab028110839f1bc3412a0cab383e27bb675de3d)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/access/rar/stream.c

@@ -129,6 +129,7 @@ static int Open(vlc_object_t *object)
         }
         RarFileDelete(f);
     }
+    free(base);
     free(files);
     if (!data)
         return VLC_EGENERIC;