erofs: fix return value check in erofs_read_superblock()
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: fe7c2423 ("erofs: use read_mapping_page instead of sb_bread") Reviewed-by:Gao Xiang <gaoxiang25@huawei.com> Reviewed-by:
Chao Yu <yuchao0@huawei.com> Signed-off-by:
Wei Yongjun <weiyongjun1@huawei.com> Link: https://lore.kernel.org/r/20190918083033.47780-1-weiyongjun1@huawei.comSigned-off-by:
Gao Xiang <gaoxiang25@huawei.com>
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