staging: rtl8723bs: remove redundant assignment to variable ret

The variable ret is being assigned an error return value that is never
read, the control passes to a return statement and ret is never referenced.
Remove the redundant assignment. Also remove an empty line.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20200729100525.573500-1-colin.king@canonical.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723bs/os_dep/osdep_service.c

@@ -146,10 +146,8 @@ int rtw_change_ifname(struct adapter *padapter, const char *ifname)
 	rereg_priv->old_pnetdev = cur_pnetdev;
 
 	pnetdev = rtw_init_netdev(padapter);
-	if (!pnetdev)  {
-		ret = -1;
+	if (!pnetdev)
 		goto error;
-	}
 
 	SET_NETDEV_DEV(pnetdev, dvobj_to_dev(adapter_to_dvobj(padapter)));
 
@@ -170,9 +168,7 @@ int rtw_change_ifname(struct adapter *padapter, const char *ifname)
 	return 0;
 
 error:
-
 	return -1;
-
 }
 
 void rtw_buf_free(u8 **buf, u32 *buf_len)