lavf/format.c: use AVPROBE_SCORE_MIME instead of AVPROBE_SCORE_EXTENSION for matching mime types

Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/format.c

@@ -217,7 +217,7 @@ AVInputFormat *av_probe_input_format3(AVProbeData *pd, int is_opened,
                 score = AVPROBE_SCORE_EXTENSION;
         }
         if (av_match_name(lpd.mime_type, fmt1->mime_type))
-            score = FFMAX(score, AVPROBE_SCORE_EXTENSION);
+            score = FFMAX(score, AVPROBE_SCORE_MIME);
         if (score > score_max) {
             score_max = score;
             fmt       = fmt1;