h264: don't be so picky on decoding pps in extradata.

Fixes issue2517
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Anton Khirnov <anton@khirnov.net>

libavcodec/h264.c

@@ -995,7 +995,7 @@ int ff_h264_decode_extradata(H264Context *h)
         cnt = *(p++); // Number of pps
         for (i = 0; i < cnt; i++) {
             nalsize = AV_RB16(p) + 2;
-            if(decode_nal_units(h, p, nalsize)  != nalsize) {
+            if (decode_nal_units(h, p, nalsize) < 0) {
                 av_log(avctx, AV_LOG_ERROR, "Decoding pps %d from avcC failed\n", i);
                 return -1;
             }