drm/dp/mst: Reduce nested ifs

Replace the nested ifs with a single if and a logical AND.

Cc: Lyude Paul <lyude@redhat.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190925141442.23236-1-ville.syrjala@linux.intel.comReviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

drivers/gpu/drm/drm_dp_mst_topology.c

@@ -1123,8 +1123,8 @@ static void drm_dp_mst_put_payload_id(struct drm_dp_mst_topology_mgr *mgr,
 	clear_bit(vcpi - 1, &mgr->vcpi_mask);
 
 	for (i = 0; i < mgr->max_payloads; i++) {
-		if (mgr->proposed_vcpis[i])
-			if (mgr->proposed_vcpis[i]->vcpi == vcpi) {
+		if (mgr->proposed_vcpis[i] &&
+		    mgr->proposed_vcpis[i]->vcpi == vcpi) {
 			mgr->proposed_vcpis[i] = NULL;
 			clear_bit(i + 1, &mgr->payload_mask);
 		}