avformat/rl2: fix memleak when read end of file

Signed-off-by: Steven Liu <lq@chinaffmpeg.org>

libavformat/rl2.c

@@ -171,18 +171,24 @@ static av_cold int rl2_read_header(AVFormatContext *s)
 
     /** read offset and size tables */
     for(i=0; i < frame_count;i++) {
-        if (avio_feof(pb))
-            return AVERROR_INVALIDDATA;
+        if (avio_feof(pb)) {
+            ret = AVERROR_INVALIDDATA;
+            goto end;
+        }
         chunk_size[i] = avio_rl32(pb);
     }
     for(i=0; i < frame_count;i++) {
-        if (avio_feof(pb))
-            return AVERROR_INVALIDDATA;
+        if (avio_feof(pb)) {
+            ret = AVERROR_INVALIDDATA;
+            goto end;
+        }
         chunk_offset[i] = avio_rl32(pb);
     }
     for(i=0; i < frame_count;i++) {
-        if (avio_feof(pb))
-            return AVERROR_INVALIDDATA;
+        if (avio_feof(pb)) {
+            ret = AVERROR_INVALIDDATA;
+            goto end;
+        }
         audio_size[i] = avio_rl32(pb) & 0xFFFF;
     }
 
@@ -203,7 +209,7 @@ static av_cold int rl2_read_header(AVFormatContext *s)
         ++video_frame_counter;
     }
 
-
+end:
     av_free(chunk_size);
     av_free(audio_size);
     av_free(chunk_offset);