anolis: erofs: kill the unnecessary kunmap_atomic in erofs_read_raw_p…

…age()

ANBZ: torvalds#511

Or unexpected behaviors could happen because erofs_put_metabuf()
already does it.

It only has bad impacts when using erofs on block devices.

Fixes: 6a5a279 ("erofs: introduce meta buffer operations")
Reviewed-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Tested-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

fs/erofs/data.c

@@ -371,9 +371,7 @@ static inline struct bio *erofs_read_raw_page(struct bio *bio,
 			memcpy(vto, vsrc + blkoff, map.m_plen);
 			memset(vto + map.m_plen, 0, PAGE_SIZE - map.m_plen);
 			kunmap_atomic(vto);
-			kunmap_atomic(vsrc);
 			flush_dcache_page(page);
-
 			SetPageUptodate(page);
 
 			erofs_put_metabuf(&buf);