Remove warnings from test_functions.c

Remove warnings from test_functions.c

Fix following warnings:
test_functions.c: In function ‘group_modified’:
test_functions.c:435: warning: format ‘%d’ expects type ‘int *’, but argument
3 has type ‘_Bool *’
test_functions.c:440: warning: format ‘%lld’ expects type ‘long long int *’,
but argument 3 has type ‘int64_t *’
test_functions.c:445: warning: format ‘%llu’ expects type ‘long long unsigned
int *’, but argument 3 has type ‘u_int64_t *’

Signed-off-by: Jan Safranek <jsafrane@redhat.com>
Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com>