drm: Make drm_dp_mst_dsc_aux_for_port() safe for old compilers

Older compilers either want two extra pairs of curly braces around the
initializer for local variable desc, or they want a single pair of curly
braces with nothing inside.  Because current Linux-kernel practice favors
the latter, this commit makes it so.

Suggested-by: Chris Wilson <[email protected]>
Suggested-by: Joe Perches <[email protected]>
Suggested-by: Christoph Hellwig <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>

Author: paulmckrcu

drivers/gpu/drm/drm_dp_mst_topology.c

@@ -5494,7 +5494,7 @@ struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port)
 {
 	struct drm_dp_mst_port *immediate_upstream_port;
 	struct drm_dp_mst_port *fec_port;
-	struct drm_dp_desc desc = { 0 };
+	struct drm_dp_desc desc = { };
 	u8 endpoint_fec;
 	u8 endpoint_dsc;