Merge commit '4c51fe48'

* commit '4c51fe48':
  h264: Copy h264chroma dsp context to slice thread copies
  swscale: Disallow conversion to GBRP16

Conflicts:
	libswscale/utils.c
	tests/ref/lavfi/pixdesc
	tests/ref/lavfi/pixfmts_copy
	tests/ref/lavfi/pixfmts_null
	tests/ref/lavfi/pixfmts_scale
	tests/ref/lavfi/pixfmts_vflip
Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/h264.c

@@ -2638,8 +2638,8 @@ static int h264_slice_header_init(H264Context *h, int reinit)
             memcpy(c, h->s.thread_context[i], sizeof(MpegEncContext));
             memset(&c->s + 1, 0, sizeof(H264Context) - sizeof(MpegEncContext));
             c->h264dsp     = h->h264dsp;
-            c->h264chroma  = h->h264chroma;
             c->h264qpel    = h->h264qpel;
+            c->h264chroma  = h->h264chroma;
             c->sps         = h->sps;
             c->pps         = h->pps;
             c->pixel_shift = h->pixel_shift;