Fix libstriprados::stat, use strtoll insdead of strtol

The return value(long int) of strict_strtol is too small for unstriped
object.

Signed-off-by: Dongmao Zhang <deanraccoon@gmail.com>
Merge pull request #2929 from thesues/master

Fix libstriprados::stat, use strtoll insdead of strtol

Reviewed-by: Loic Dachary <ldachary@redhat.com>