drm/amd/display: Ensure curve to hw translation succeed

[WHAT & HOW]
Check cm3_helper_translate_curve_to_hw_format runs successfully so the
regamma_params is valid and can be used.

Also revmoed two result assignments.

This fixes 2 CHECKED_RETURN UNUSED_VALUE issues reported by Coverity.
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/hwss/dcn30/dcn30_hwseq.c

@@ -228,8 +228,11 @@ bool dcn30_set_blend_lut(
 	if (plane_state->blend_tf.type == TF_TYPE_HWPWL)
 		blend_lut = &plane_state->blend_tf.pwl;
 	else if (plane_state->blend_tf.type == TF_TYPE_DISTRIBUTED_POINTS) {
-		cm3_helper_translate_curve_to_hw_format(
+		result = cm3_helper_translate_curve_to_hw_format(
 				&plane_state->blend_tf, &dpp_base->regamma_params, false);
+		if (!result)
+			return result;
+
 		blend_lut = &dpp_base->regamma_params;
 	}
 	result = dpp_base->funcs->dpp_program_blnd_lut(dpp_base, blend_lut);

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

@@ -483,11 +483,14 @@ bool dcn32_set_mcm_luts(
 	if (plane_state->blend_tf.type == TF_TYPE_HWPWL)
 		lut_params = &plane_state->blend_tf.pwl;
 	else if (plane_state->blend_tf.type == TF_TYPE_DISTRIBUTED_POINTS) {
-		cm3_helper_translate_curve_to_hw_format(&plane_state->blend_tf,
+		result = cm3_helper_translate_curve_to_hw_format(&plane_state->blend_tf,
 				&dpp_base->regamma_params, false);
+		if (!result)
+			return result;
+
 		lut_params = &dpp_base->regamma_params;
 	}
-	result = mpc->funcs->program_1dlut(mpc, lut_params, mpcc_id);
+	mpc->funcs->program_1dlut(mpc, lut_params, mpcc_id);
 	lut_params = NULL;
 
 	// Shaper
@@ -501,7 +504,7 @@ bool dcn32_set_mcm_luts(
 		lut_params = &dpp_base->shaper_params;
 	}
 
-	result = mpc->funcs->program_shaper(mpc, lut_params, mpcc_id);
+	mpc->funcs->program_shaper(mpc, lut_params, mpcc_id);
 
 	// 3D
 	if (plane_state->lut3d_func.state.bits.initialized == 1)