drm/amd/display: Reduce stack usage

Reduce stack usage by moving an unnecessary structure copy to a pointer.
Reviewed-by: Joshua Aberback <Joshua.Aberback@amd.com>
Acked-by: Pavle Kotarac <Pavle.Kotarac@amd.com>
Signed-off-by: Aric Cyr <aric.cyr@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -3001,12 +3001,12 @@ static void commit_planes_for_stream(struct dc *dc,
 #ifdef CONFIG_DRM_AMD_DC_DCN
 		if (dc->debug.validate_dml_output) {
 			for (i = 0; i < dc->res_pool->pipe_count; i++) {
-				struct pipe_ctx cur_pipe = context->res_ctx.pipe_ctx[i];
-				if (cur_pipe.stream == NULL)
+				struct pipe_ctx *cur_pipe = &context->res_ctx.pipe_ctx[i];
+				if (cur_pipe->stream == NULL)
 					continue;
 
-				cur_pipe.plane_res.hubp->funcs->validate_dml_output(
-						cur_pipe.plane_res.hubp, dc->ctx,
+				cur_pipe->plane_res.hubp->funcs->validate_dml_output(
+						cur_pipe->plane_res.hubp, dc->ctx,
 						&context->res_ctx.pipe_ctx[i].rq_regs,
 						&context->res_ctx.pipe_ctx[i].dlg_regs,
 						&context->res_ctx.pipe_ctx[i].ttu_regs);