avformat/icodec: Simplify cleanup after read_header failure

by setting the FF_FMT_INIT_CLEANUP flag.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavformat/icodec.c

@@ -96,13 +96,11 @@ static int read_header(AVFormatContext *s)
         int tmp;
 
         if (avio_seek(pb, 6 + i * 16, SEEK_SET) < 0)
-            goto fail;
+            return AVERROR_INVALIDDATA;
 
         st = avformat_new_stream(s, NULL);
-        if (!st) {
-            av_freep(&ico->images);
+        if (!st)
             return AVERROR(ENOMEM);
-        }
 
         st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
         st->codecpar->width      = avio_r8(pb);
@@ -116,12 +114,12 @@ static int read_header(AVFormatContext *s)
         ico->images[i].size   = avio_rl32(pb);
         if (ico->images[i].size <= 0) {
             av_log(s, AV_LOG_ERROR, "Invalid image size %d\n", ico->images[i].size);
-            goto fail;
+            return AVERROR_INVALIDDATA;
         }
         ico->images[i].offset = avio_rl32(pb);
 
         if (avio_seek(pb, ico->images[i].offset, SEEK_SET) < 0)
-            goto fail;
+            return AVERROR_INVALIDDATA;
 
         codec = avio_rl32(pb);
         switch (codec) {
@@ -131,9 +129,8 @@ static int read_header(AVFormatContext *s)
             st->codecpar->height   = 0;
             break;
         case 40:
-            if (ico->images[i].size < 40) {
-                goto fail;
-            }
+            if (ico->images[i].size < 40)
+                return AVERROR_INVALIDDATA;
             st->codecpar->codec_id = AV_CODEC_ID_BMP;
             tmp = avio_rl32(pb);
             if (tmp)
@@ -144,14 +141,11 @@ static int read_header(AVFormatContext *s)
             break;
         default:
             avpriv_request_sample(s, "codec %d", codec);
-            goto fail;
+            return AVERROR_INVALIDDATA;
         }
     }
 
     return 0;
-fail:
-    av_freep(&ico->images);
-    return AVERROR_INVALIDDATA;
 }
 
 static int read_packet(AVFormatContext *s, AVPacket *pkt)
@@ -224,6 +218,7 @@ const AVInputFormat ff_ico_demuxer = {
     .name           = "ico",
     .long_name      = NULL_IF_CONFIG_SMALL("Microsoft Windows ICO"),
     .priv_data_size = sizeof(IcoDemuxContext),
+    .flags_internal = FF_FMT_INIT_CLEANUP,
     .read_probe     = probe,
     .read_header    = read_header,
     .read_packet    = read_packet,