avcodec/h264_parse: return SPS/PPS errors from avcC with explode

decode_extradata_ps_mp4() skips the retry with an escaped NAL when
AV_EF_EXPLODE is set, but then returns 0 regardless, so a parameter set
that fails to parse in avcC extradata is silently ignored exactly when
the caller asked for errors to be fatal. h264_decode_init() fails on
extradata errors only with explode, so avcodec_open2() succeeded with
-err_detect explode on avcC extradata with a broken SPS, and the
"Decoding sps %d from avcC failed" path was unreachable.

Return the error when explode is set.

Signed-off-by: Martin Mirchev <mmirchev@comp.nus.edu.sg>

libavcodec/h264_parse.c

@@ -424,7 +424,9 @@ static int decode_extradata_ps_mp4(const uint8_t *buf, int buf_size, H264ParamSe
     int ret;
 
     ret = decode_extradata_ps(buf, buf_size, ps, 1, logctx);
-    if (ret < 0 && !(err_recognition & AV_EF_EXPLODE)) {
+    if (ret < 0 && (err_recognition & AV_EF_EXPLODE))
+        return ret;
+    if (ret < 0) {
         GetByteContext gbc;
         PutByteContext pbc;
         uint8_t *escaped_buf;