Bug 750625 - Fix Coverity (11107) Dereference before null check
    
    https://bugzilla.redhat.com/show_bug.cgi?id=750625
    
    plugins/acl/acl.c (acl__resource_match_aci)
    
    Bug Description: Dereferencing "aclpb" before a null check.
    
    Fix Description: Since there is a chance that passed "aclpb" is NULL,
    acl__resource_match_aci checks if "aclpb" is NULL or not at the top
    of the function and if it is, goto acl__resource_match_aci_EXIT.