st/vdpau: Destroy context when initialization fails

Prevents a potential memory leak found when tracking down something else.

Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Tom Stellard <thomas.stellard@amd.com>

CC: "10.0" <mesa-stable@lists.freedesktop.org>

src/gallium/state_trackers/vdpau/device.c

@@ -86,6 +86,7 @@ vdp_imp_device_create_x11(Display *display, int screen, VdpDevice *device,
    return VDP_STATUS_OK;
 
 no_handle:
+   dev->context->destroy(dev->context);
    /* Destroy vscreen */
 no_context:
    vl_screen_destroy(dev->vscreen);