drm/gma500: fix a potential repeat execution in psb_driver_load

Instead of exiting the loop as expected when an entry is found, the
list_for_each_entry() continues until the traversal is complete. To
avoid potential executing 'ret = gma_backlight_init(dev);' repeatly,
goto outside the loop when found entry by replacing switch/case with
if statement.

Signed-off-by: Xiaomeng Tong <xiam0nd.tong@gmail.com>
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
[Fixed indentation]
Link: https://patchwork.freedesktop.org/patch/msgid/20220413051105.5612-1-xiam0nd.tong@gmail.com

drivers/gpu/drm/gma500/psb_drv.c

@@ -396,9 +396,8 @@ static int psb_driver_load(struct drm_device *dev, unsigned long flags)
 	drm_for_each_connector_iter(connector, &conn_iter) {
 		gma_encoder = gma_attached_encoder(connector);
 
-		switch (gma_encoder->type) {
-		case INTEL_OUTPUT_LVDS:
-		case INTEL_OUTPUT_MIPI:
+		if (gma_encoder->type == INTEL_OUTPUT_LVDS ||
+		    gma_encoder->type == INTEL_OUTPUT_MIPI) {
 			ret = gma_backlight_init(dev);
 			break;
 		}