sss_ptr_hash_delete_all: use unsigned long int
    
    hash_values() expects a pointer to unsigned long int as second
    argument. Using size_t instead causes a 'from incompatible pointer type'
    compiler error on e.g. 32bit platforms because size_t is 32bits here
    while unsigned long int is 64bits.
    
    Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>