[PATCH -next] erofs: fix return value check in erofs_read_superblock()

[Wei Yongjun]

In case of error, the function read_mapping_page() returns
ERR_PTR() not NULL. The NULL test in the return value check
should be replaced with IS_ERR().

Fixes: fe7c2423570d ("erofs: use read_mapping_page instead of sb_bread")
Signed-off-by: Wei Yongjun <weiyongj...@huawei.com>
---
 fs/erofs/super.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index caf9a95173b0..0e369494f2f2 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -105,9 +105,9 @@ static int erofs_read_superblock(struct super_block *sb)
        int ret;
 
        page = read_mapping_page(sb->s_bdev->bd_inode->i_mapping, 0, NULL);
-       if (!page) {
+       if (IS_ERR(page)) {
                erofs_err(sb, "cannot read erofs superblock");
-               return -EIO;
+               return PTR_ERR(page);
        }
 
        sbi = EROFS_SB(sb);