avformat/movenc: fix if vs if else

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/movenc.c

@@ -1590,7 +1590,7 @@ static int mov_write_hdlr_tag(AVIOContext *pb, MOVTrack *track)
                 descr = "ClosedCaptionHandler";
             } else {
             if (track->tag == MKTAG('t','x','3','g')) hdlr_type = "sbtl";
-            if (track->tag == MKTAG('m','p','4','s')) hdlr_type = "subp";
+            else if (track->tag == MKTAG('m','p','4','s')) hdlr_type = "subp";
             else                                      hdlr_type = "text";
             descr = "SubtitleHandler";
             }