Properly free up resources allocated in swapmode(). This is not quite

the patch submitted by Philippe Charnier since he wasn't actually freeing
the resources early enough (an earlier return could be invoked, leaving
the resources still allocated), but he definitely pointed it out.  Merci,
Philippe!
Suggested-By: Philippe Charnier <charnier@lirmm.fr>

usr.sbin/pstat/pstat.c

@@ -1157,6 +1157,8 @@ swapmode()
 	 * need to bother with totals.
 	 */
 	used = avail - nfree;
+	free(sw);
+	free(perdev);
 	if (totalflag) {
 		(void)printf("%dM/%dM swap space\n", used / 2048, avail / 2048);
 		return;