Staging: rtl8723au: Remove return in void function

WARNING: void function return statements are not generally useful
Remove return in void function. That was found by running checkpatch.

Signed-off-by: Melike Yurtoglu <aysemelikeyurtoglu@gmail.com>
Reviewed-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/rtl8723au/os_dep/usb_intf.c b/drivers/staging/rtl8723au/os_dep/usb_intf.c
index 05755b8..a6969a0 100644
--- a/drivers/staging/rtl8723au/os_dep/usb_intf.c
+++ b/drivers/staging/rtl8723au/os_dep/usb_intf.c
@@ -599,8 +599,6 @@
 
 	RT_TRACE(_module_hci_intfs_c_, _drv_err_, ("-dev_remove()\n"));
 	DBG_8723A("-r871xu_dev_remove, done\n");
-
-	return;
 }
 
 static int __init rtw_drv_entry(void)