tst_atomic: make tst_atomic_inc take a signed integer

This is a preparation for upcoming patches, which add atomic_add_return(),
based on kernel function of same name. Kernel's atomic_t is int based,
so let's match that.

Signed-off-by: Jan Stancek <jstancek@redhat.com>
Acked-by: Cyril Hrubis <chrubis@suse.cz>
4 files changed