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/ocfs2/namei.c b/fs/ocfs2/namei.c
index a8b2bfe..c779f8b 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -602,7 +602,7 @@
 
 static int ocfs2_mkdir(struct inode *dir,
 		       struct dentry *dentry,
-		       int mode)
+		       umode_t mode)
 {
 	int ret;