avformat/takdec: Free buffer on error pathes

Fixes: memleak
Fixes: 15446/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5662875831500800

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/takdec.c

@@ -146,7 +146,7 @@ static int tak_read_header(AVFormatContext *s)
 
             ret = avpriv_tak_parse_streaminfo(&ti, buffer, size -3);
             if (ret < 0)
-                return AVERROR_INVALIDDATA;
+                goto end;
             if (ti.samples > 0)
                 st->duration = ti.samples;
             st->codecpar->bits_per_coded_sample = ti.bps;
@@ -160,8 +160,10 @@ static int tak_read_header(AVFormatContext *s)
             st->codecpar->extradata_size        = size - 3;
             buffer                           = NULL;
         } else if (type == TAK_METADATA_LAST_FRAME) {
-            if (size != 11)
-                return AVERROR_INVALIDDATA;
+            if (size != 11) {
+                ret = AVERROR_INVALIDDATA;
+                goto end;
+            }
             init_get_bits8(&gb, buffer, size - 3);
             tc->mlast_frame = 1;
             tc->data_end    = get_bits64(&gb, TAK_LAST_FRAME_POS_BITS) +
@@ -176,6 +178,9 @@ static int tak_read_header(AVFormatContext *s)
     }
 
     return AVERROR_EOF;
+end:
+    av_freep(&buffer);
+    return ret;
 }
 
 static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)