bluetooth: controller: Return code from sdc_init was overwirtten

There is a bug in hci_driver_init() that overwrites sdc_init()
return code. That can lead to wired behavior in the host and
stack cooperation if there is an error during SDC init.

The commit fixes the issue.

Signed-off-by: Piotr Pryga <piotr.pryga@nordicsemi.no>

subsys/bluetooth/controller/hci_driver.c

@@ -1519,6 +1519,9 @@ static int hci_driver_init(const struct device *dev)
 	int err = 0;
 
 	err = sdc_init(sdc_assertion_handler);
+	if (err) {
+		return err;
+	}
 
 	err = configure_supported_features();
 	if (err) {