drm/amd/display: Adding braces to prepare for future changes to behavior of if block

[Why & How]
For certain features, there will be more implementations needed in the if-block.
Braces are added as part of the preparation.
Acked-by: NAurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: NLeo Chen <sancchen@amd.com>
Reviewed-by: NCharlene Liu <Charlene.Liu@amd.com>
Tested-by: NDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -2008,8 +2008,9 @@ bool dc_commit_state(struct dc *dc, struct dc_state *context)
 		return result == DC_OK;
 	}
 
-	if (!streams_changed(dc, context->streams, context->stream_count))
+	if (!streams_changed(dc, context->streams, context->stream_count)) {
 		return DC_OK;
+	}
 
 	DC_LOG_DC("%s: %d streams\n",
 				__func__, context->stream_count);