drm/vaapi: Fix pointer-size confusion

The API expects uintptr_t (good!), but we're passing an unsigned long
here. Make the conversion explicit.

Signed-off-by: Daniel Stone <daniels@collabora.com>

libweston/backend-drm/vaapi-recorder.c

@@ -1018,7 +1018,7 @@ create_surface_from_fd(struct vaapi_recorder *r, int prime_fd,
 	va_attrib_extbuf.num_planes = 1;
 	va_attrib_extbuf.pitches[0] = stride;
 	va_attrib_extbuf.offsets[0] = 0;
-	va_attrib_extbuf.buffers = &buffer_fd;
+	va_attrib_extbuf.buffers = (uintptr_t *) &buffer_fd;
 	va_attrib_extbuf.num_buffers = 1;
 	va_attrib_extbuf.flags = 0;
 	va_attrib_extbuf.private_data = NULL;