f2fs: change error code to -ENOMEM from -EINVAL

The error case of failing allocating memory should
return -ENOMEM.
Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/super.c

@@ -269,7 +269,7 @@ static int f2fs_set_qf_name(struct super_block *sb, int qtype,
 	if (!qname) {
 		f2fs_msg(sb, KERN_ERR,
 			"Not enough memory for storing quotafile name");
-		return -EINVAL;
+		return -ENOMEM;
 	}
 	if (F2FS_OPTION(sbi).s_qf_names[qtype]) {
 		if (strcmp(F2FS_OPTION(sbi).s_qf_names[qtype], qname) == 0)