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/bad_inode.c b/fs/bad_inode.c
index 9205cf2..5a2738c 100644
--- a/fs/bad_inode.c
+++ b/fs/bad_inode.c
@@ -202,7 +202,7 @@
 }
 
 static int bad_inode_mkdir(struct inode *dir, struct dentry *dentry,
-			int mode)
+			umode_t mode)
 {
 	return -EIO;
 }