switch vfs_mkdir() and ->mkdir() to umode_t

vfs_mkdir() gets int, but immediately drops everything that might not
fit into umode_t and that's the only caller of ->mkdir()...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/hfs/dir.c b/fs/hfs/dir.c
index bce4eef..06dc161 100644
--- a/fs/hfs/dir.c
+++ b/fs/hfs/dir.c
@@ -216,7 +216,7 @@
  * in a directory, given the inode for the parent directory and the
  * name (and its length) of the new directory.
  */
-static int hfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+static int hfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 {
 	struct inode *inode;
 	int res;