uts: give privilege macros more sensible names

@@ -804,11 +804,11 @@
                         oldcred = curthread->t_cred;
                         curthread->t_cred = cred;
                         crfree(oldcred);
 
                         if (priv_basic_test >= 0 &&
-                            !PRIV_ISASSERT(&CR_IPRIV(newcred),
+                            !PRIV_ISMEMBER(&CR_IPRIV(newcred),
                             priv_basic_test)) {
                                 pid_t pid = pp->p_pid;
                                 char *fn = PTOU(pp)->u_comm;
 
                                 cmn_err(CE_WARN, "%s[%d]: exec: basic_test "