Replace obsolete simple_strtoul() with kstrtou8/kstrtouint.
Signed-off-by: Nmajianpeng <majianpeng@gmail.com>
Signed-off-by: NMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: NAlasdair G Kergon <agk@redhat.com>