Before updating the password database, the pw(8) utility first performs a

sanity check by invoking "pwd_mkdb -C".  However, if this failed it
silently returned success.  Fix this so it fails the update operation
instead.

MFC after:	1 week

usr.sbin/pw/pwupd.c

@@ -148,7 +148,8 @@ pw_update(struct passwd * pwd, char const * user, int mode)
 	 * Note: -C is only available in FreeBSD 2.2 and above
 	 */
 #ifdef HAVE_PWDB_C
-	if (pwdb("-C", (char *)NULL) == 0) {	/* Check only */
+	rc = pwdb("-C", (char *)NULL);	/* Check only */
+	if (rc == 0) {
 #else
 	{				/* No -C */
 #endif