Merge remote-tracking branch 'cehoyos/master'

* cehoyos/master:
  Decode png images without iend chunk.

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

libavcodec/pngdec.c

@@ -546,6 +546,9 @@ static int decode_frame(AVCodecContext *avctx,
     for (;;) {
         if (bytestream2_get_bytes_left(&s->gb) <= 0) {
             av_log(avctx, AV_LOG_ERROR, "No bytes left\n");
+            if (   s->state & PNG_ALLIMAGE
+                && avctx->strict_std_compliance <= FF_COMPLIANCE_NORMAL)
+                goto exit_loop;
             goto fail;
         }