This reverts commite0910c8e4f. Reverting6ffeb1c3f8("md: change mddev 'chunk_sectors' from int to unsigned") exposes dm-raid.c compiler warnings detailed that commit's header. Clearly this more conservative fix, of simply revertinge0910c8e4f, would've been more prudent given how late we were in the v5.10 release. Lessons have been learned. Signed-off-by: Mike Snitzer <snitzer@redhat.com>