drm/amd/display: Check return of shaper curve to HW format

[Why & How]
Check return of cm3_helper_translate_curve_to_hw_format.

This is reported as a CHECKED_RETURN error by Coverity.

Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Ray Wu <ray.wu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: Alex Hung

drivers/gpu/drm/amd/display/dc/hwss/dcn32/dcn32_hwseq.c

@@ -486,7 +486,7 @@ bool dcn32_set_mcm_luts(
 	struct dpp *dpp_base = pipe_ctx->plane_res.dpp;
 	int mpcc_id = pipe_ctx->plane_res.hubp->inst;
 	struct mpc *mpc = pipe_ctx->stream_res.opp->ctx->dc->res_pool->mpc;
-	bool result = true;
+	bool rval, result;
 	const struct pwl_params *lut_params = NULL;
 
 	// 1D LUT
@@ -509,10 +509,10 @@ bool dcn32_set_mcm_luts(
 		lut_params = &plane_state->in_shaper_func.pwl;
 	else if (plane_state->in_shaper_func.type == TF_TYPE_DISTRIBUTED_POINTS) {
 		// TODO: dpp_base replace
-		cm3_helper_translate_curve_to_hw_format(plane_state->ctx,
+		rval = cm3_helper_translate_curve_to_hw_format(plane_state->ctx,
 							&plane_state->in_shaper_func,
 							&dpp_base->shaper_params, true);
-		lut_params = &dpp_base->shaper_params;
+		lut_params = rval ? &dpp_base->shaper_params : NULL;
 	}
 
 	mpc->funcs->program_shaper(mpc, lut_params, mpcc_id);