switch ->mknod() to umode_t

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

fs/ext4/namei.c

@@ -1770,7 +1770,7 @@ retry:
 }
 
 static int ext4_mknod(struct inode *dir, struct dentry *dentry,
-		      int mode, dev_t rdev)
+		      umode_t mode, dev_t rdev)
 {
 	handle_t *handle;
 	struct inode *inode;