avcodec/crystalhd: Explicitly set frame pts at all times

Previously, the pts value was initialised to AV_NOPTS_VALUE and so
it was not necessary to always set it. Now, with the new-new decode
API, this is no longer true. I'm not sure why I avoided setting the
pts when the decoder value was also AV_NOPTS_VALUE - it clearly
wouldn't have changed anything previously, but here we are.

Failing to do this, means the frame pts will be some random uninitalised
value.

libavcodec/crystalhd.c

@@ -537,14 +537,13 @@ static inline CopyRet copy_frame(AVCodecContext *avctx,
     if (interlaced)
         frame->top_field_first = !bottom_first;
 
-    if (pkt_pts != AV_NOPTS_VALUE) {
     frame->pts = pkt_pts;
 #if FF_API_PKT_PTS
 FF_DISABLE_DEPRECATION_WARNINGS
     frame->pkt_pts = pkt_pts;
 FF_ENABLE_DEPRECATION_WARNINGS
 #endif
-    }
+
     frame->pkt_pos = -1;
     frame->pkt_duration = 0;
     frame->pkt_size = -1;