avcodec/libx264: Check init_get_bits8() return code

Fixes: CID1594529 Unchecked return value

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit dce69ba89e)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/libx264.c

@@ -929,7 +929,9 @@ static int set_avcc_extradata(AVCodecContext *avctx, x264_nal_t *nal, int nnal)
          *
          * +4 to skip until sps id.
          */
-        init_get_bits8(&gbc, sps + 4, sps_nal->i_payload - 4 - 4);
+        ret = init_get_bits8(&gbc, sps + 4, sps_nal->i_payload - 4 - 4);
+        if (ret < 0)
+            return ret;
         // Skip sps id
         get_ue_golomb_31(&gbc);
         chroma_format_idc = get_ue_golomb_31(&gbc);