st/vdpau: don't return a device if the screen doesn't support NPOT

NV3x cards don't support NPOT textures. Technically this restriction
could be worked around, but since it also doesn't expose any video
decoding hw, just turn it off entirely.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: 10.0 <mesa-stable@lists.freedesktop.org>
Reviewed-by: Christian König <christian.koenig@amd.com>

src/gallium/state_trackers/vdpau/device.c

@@ -72,6 +72,11 @@ vdp_imp_device_create_x11(Display *display, int screen, VdpDevice *device,
       goto no_context;
    }
 
+   if (!pscreen->get_param(pscreen, PIPE_CAP_NPOT_TEXTURES)) {
+      ret = VDP_STATUS_NO_IMPLEMENTATION;
+      goto no_context;
+   }
+
    *device = vlAddDataHTAB(dev);
    if (*device == 0) {
       ret = VDP_STATUS_ERROR;