drm/amd/display: Check stream_status before it is used

[WHAT & HOW]
dc_state_get_stream_status can return null, and therefore null must be
checked before stream_status is used.

This fixes 1 NULL_RETURNS issue reported by Coverity.

Signed-off-by: Alex Hung <alex.hung@amd.com>
Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc.c

@@ -3748,7 +3748,7 @@ static void commit_planes_for_stream_fast(struct dc *dc,
 				surface_count,
 				stream,
 				context);
-	} else {
+	} else if (stream_status) {
 		build_dmub_cmd_list(dc,
 				srf_updates,
 				surface_count,