Fixes the following sparse warnings:
net/9p/trans_xen.c:528:5: warning:
 symbol 'p9_trans_xen_init' was not declared. Should it be static?
net/9p/trans_xen.c:540:6: warning:
 symbol 'p9_trans_xen_exit' was not declared. Should it be static?
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
        .otherend_changed = xen_9pfs_front_changed,
 };
 
-int p9_trans_xen_init(void)
+static int p9_trans_xen_init(void)
 {
        if (!xen_domain())
                return -ENODEV;
 }
 module_init(p9_trans_xen_init);
 
-void p9_trans_xen_exit(void)
+static void p9_trans_xen_exit(void)
 {
        v9fs_unregister_trans(&p9_xen_trans);
        return xenbus_unregister_driver(&xen_9pfs_front_driver);