init_rootfs(): don't bother with init_ramfs_fs()

the only thing done by the latter is making ramfs visible
to mount(2); we don't need it there - rootfs is separate
and, in fact, made visible to mount(2) in the same init_rootfs().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/ramfs/inode.c

@@ -266,12 +266,8 @@ static struct file_system_type ramfs_fs_type = {
 	.fs_flags	= FS_USERNS_MOUNT,
 };
 
-int __init init_ramfs_fs(void)
+static int __init init_ramfs_fs(void)
 {
-	static unsigned long once;
-
-	if (test_and_set_bit(0, &once))
-		return 0;
 	return register_filesystem(&ramfs_fs_type);
 }
 fs_initcall(init_ramfs_fs);