drm/amd/display: Fix writeback_info never got updated

[WHY]
wb_enabled field is set to false before it is used, and the following
code will never be executed.

[HOW]
Setting wb_enable to false after all removal work is completed.
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -558,18 +558,13 @@ bool dc_stream_remove_writeback(struct dc *dc,
 		return false;
 	}
 
-//	stream->writeback_info[dwb_pipe_inst].wb_enabled = false;
-	for (i = 0; i < stream->num_wb_info; i++) {
-		/*dynamic update*/
-		if (stream->writeback_info[i].wb_enabled &&
-			stream->writeback_info[i].dwb_pipe_inst == dwb_pipe_inst) {
-			stream->writeback_info[i].wb_enabled = false;
-		}
-	}
-
 	/* remove writeback info for disabled writeback pipes from stream */
 	for (i = 0, j = 0; i < stream->num_wb_info; i++) {
 		if (stream->writeback_info[i].wb_enabled) {
+
+			if (stream->writeback_info[i].dwb_pipe_inst == dwb_pipe_inst)
+				stream->writeback_info[i].wb_enabled = false;
+
 			if (j < i)
 				/* trim the array */
 				memcpy(&stream->writeback_info[j], &stream->writeback_info[i],