drm/amd/display: fix ifnullfree.cocci warnings

drivers/gpu/drm/amd/amdgpu/../display/dc/gpio/gpio_service.c:134:3-8: WARNING: NULL check before freeing functions like kfree, debugfs_remove, debugfs_remove_recursive or usb_free_urb is not needed. Maybe consider reorganizing relevant code to avoid passing NULL values.
drivers/gpu/drm/amd/amdgpu/../display/dc/gpio/gpio_service.c:175:4-9: WARNING: NULL check before freeing functions like kfree, debugfs_remove, debugfs_remove_recursive or usb_free_urb is not needed. Maybe consider reorganizing relevant code to avoid passing NULL values.

 NULL check before some freeing functions is not needed.

 Based on checkpatch warning
 "kfree(NULL) is safe this check is probably not required"
 and kfreeaddr.cocci by Julia Lawall.

Generated by: scripts/coccinelle/free/ifnullfree.cocci

Fixes: f09cd1f46388 ("drm/amd/display: Use kernel alloc/free")
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/gpio/gpio_service.c

@@ -130,8 +130,7 @@ failure_2:
 
 		slot = service->busyness[index_of_id];
 
-		if (slot)
-			kfree(slot);
+		kfree(slot);
 	}
 
 failure_1:
@@ -171,8 +170,7 @@ void dal_gpio_service_destroy(
 		do {
 			uint32_t *slot = (*ptr)->busyness[index_of_id];
 
-			if (slot)
-				kfree(slot);
+			kfree(slot);
 
 			++index_of_id;
 		} while (index_of_id < GPIO_ID_COUNT);