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/ext3/namei.c b/fs/ext3/namei.c
index 642dc6d..08ecb53 100644
--- a/fs/ext3/namei.c
+++ b/fs/ext3/namei.c
@@ -1768,7 +1768,7 @@
 	return err;
 }
 
-static int ext3_mkdir(struct inode * dir, struct dentry * dentry, int mode)
+static int ext3_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
 {
 	handle_t *handle;
 	struct inode * inode;