drm/amd/display: remove useless if/else

Fix the following coccinelle report:

./drivers/gpu/drm/amd/display/dc/calcs/dce_calcs.c:1367:3-5:
WARNING: possible condition with no effect (if == else)

Both branches are the same, so remove the if/else altogether.

Fixes: 81875979 ("drm/amd/display: Remove extra pairs of parentheses in dce_calcs.c")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zou Wei <zou_wei@huawei.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1364,13 +1364,10 @@ static void calculate_bandwidth(
 	/*if stutter and dram clock state change are gated before cursor then the cursor latency hiding does not limit stutter or dram clock state change*/
 	for (i = 0; i <= maximum_number_of_surfaces - 1; i++) {
 		if (data->enable[i]) {
-			if (dceip->graphics_lb_nodownscaling_multi_line_prefetching == 1) {
-				data->maximum_latency_hiding[i] = bw_add(data->minimum_latency_hiding[i], bw_mul(bw_frc_to_fixed(5, 10), data->total_dmifmc_urgent_latency));
-			}
-			else {
-				/*maximum_latency_hiding(i) = minimum_latency_hiding(i) + 1 / vsr(i) * h_total(i) / pixel_rate(i) + 0.5 * total_dmifmc_urgent_latency*/
-				data->maximum_latency_hiding[i] = bw_add(data->minimum_latency_hiding[i], bw_mul(bw_frc_to_fixed(5, 10), data->total_dmifmc_urgent_latency));
-			}
+			/*maximum_latency_hiding(i) = minimum_latency_hiding(i) + 1 / vsr(i) **/
+			/*      h_total(i) / pixel_rate(i) + 0.5 * total_dmifmc_urgent_latency*/
+			data->maximum_latency_hiding[i] = bw_add(data->minimum_latency_hiding[i],
+				bw_mul(bw_frc_to_fixed(5, 10), data->total_dmifmc_urgent_latency));
 			data->maximum_latency_hiding_with_cursor[i] = bw_min2(data->maximum_latency_hiding[i], data->cursor_latency_hiding[i]);
 		}
 	}