quota: be aware of error from dquot_initialize

Commit 6184fc0b ("quota: Propagate error from ->acquire_dquot()")
missed to handle error from dquot_initialize in dquot_file_open, fix it.
Signed-off-by: NChao Yu <yuchao0@huawei.com>
Signed-off-by: NJan Kara <jack@suse.cz>

fs/quota/dquot.c

@@ -2140,7 +2140,7 @@ int dquot_file_open(struct inode *inode, struct file *file)
 
 	error = generic_file_open(inode, file);
 	if (!error && (file->f_mode & FMODE_WRITE))
-		dquot_initialize(inode);
+		error = dquot_initialize(inode);
 	return error;
 }
 EXPORT_SYMBOL(dquot_file_open);