erofs-utils: lib: fix `INTEGER_OVERFLOW`

Coverity-id: 569453
Fixes: 341d23a878a2 ("erofs-utils: mkfs: speed up uncompressed data handling")
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20250708021722.768644-4-hsiangkao@linux.alibaba.com
1 file changed