vdpau: fix constrained baseline fallback

It appears vdpau drivers can return constrained baseline as unsupported,
even if libvdpau knows about the symbol, and the main profile is
supported.

Signed-off-by: Anton Khirnov <anton@khirnov.net>

libavcodec/vdpau.c

@@ -173,8 +173,7 @@ int ff_vdpau_common_init(AVCodecContext *avctx, VdpDecoderProfile profile,
     status = decoder_query_caps(vdctx->device, profile, &supported, &max_level,
                                 &max_mb, &max_width, &max_height);
 #ifdef VDP_DECODER_PROFILE_H264_CONSTRAINED_BASELINE
-    if (status != VDP_STATUS_OK && profile == VDP_DECODER_PROFILE_H264_CONSTRAINED_BASELINE) {
-        /* Run-time backward compatibility for libvdpau 0.8 and earlier */
+    if ((status != VDP_STATUS_OK || supported != VDP_TRUE) && profile == VDP_DECODER_PROFILE_H264_CONSTRAINED_BASELINE) {
         profile = VDP_DECODER_PROFILE_H264_MAIN;
         status = decoder_query_caps(vdctx->device, profile, &supported,
                                     &max_level, &max_mb,