libvpxdec: fix 'ISO C90 forbids mixed declarations and code' warning

since:
cbcc88c0 libvpx: Support setting color range for vp9.
Reviewed-by: Ronald S. Bultje <rsbultje@gmail.com>
Signed-off-by: James Zern <jzern@google.com>

libavcodec/libvpxdec.c

@@ -68,13 +68,13 @@ static int set_pix_fmt(AVCodecContext *avctx, struct vpx_image *img)
         AVCOL_SPC_UNSPECIFIED, AVCOL_SPC_BT470BG, AVCOL_SPC_BT709, AVCOL_SPC_SMPTE170M,
         AVCOL_SPC_SMPTE240M, AVCOL_SPC_BT2020_NCL, AVCOL_SPC_RESERVED, AVCOL_SPC_RGB,
     };
-    avctx->colorspace = colorspaces[img->cs];
 #if VPX_IMAGE_ABI_VERSION >= 4
     static const enum AVColorRange color_ranges[] = {
         AVCOL_RANGE_MPEG, AVCOL_RANGE_JPEG
     };
     avctx->color_range = color_ranges[img->range];
 #endif
+    avctx->colorspace = colorspaces[img->cs];
 #endif
     if (avctx->codec_id == AV_CODEC_ID_VP8 && img->fmt != VPX_IMG_FMT_I420)
         return AVERROR_INVALIDDATA;