wrapper.c: null terminate string in cgroup_new_cgroup()

wrapper.c: null terminate string in cgroup_new_cgroup()

Fix non-terminated string warning, reported by Coverity tool:

CID 258290 (#1 of 1): String not null terminated (STRING_NULL)46.
string_null: Passing unterminated string aux_cgroup->name to
cgroup_create_cgroup, which expects a null-terminated string.

The call patch leading to this warning:
config.c::cgroup_config_create_template_group()
- wrapper.c::cgroup_new_cgroup()

fix it by null terminating the string.

Signed-off-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>
Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>