drm/amdgpu/display: fix compiler errors [-Werror,-Wparentheses-equality]

Remove extraneous parentheses around the comparison
to silence this warning
Signed-off-by: Pratik Vishwakarma <Pratik.Vishwakarma@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/calcs/dcn_calc_auto.c

@@ -63,7 +63,7 @@ void scaler_settings_calculation(struct dcn_bw_internal_vars *v)
 		if (v->interlace_output[k] == 1.0) {
 			v->v_ratio[k] = 2.0 * v->v_ratio[k];
 		}
-		if ((v->underscan_output[k] == 1.0)) {
+		if (v->underscan_output[k] == 1.0) {
 			v->h_ratio[k] = v->h_ratio[k] * v->under_scan_factor;
 			v->v_ratio[k] = v->v_ratio[k] * v->under_scan_factor;
 		}