Test if an acct file exists before trying to rename it. This silences

false warnings in the frist three daily mails after process accounting
has been turned on.
from Raf Czlonka

src/etc/daily

@@ -1,5 +1,5 @@
 #
-#	$OpenBSD: daily,v 1.89 2017/06/10 11:28:30 bluhm Exp $
+#	$OpenBSD: daily,v 1.90 2017/07/10 11:18:48 bluhm Exp $
 #	From: @(#)daily	8.2 (Berkeley) 1/25/94
 #
 # For local additions, create the file /etc/daily.local.
@@ -66,9 +66,12 @@ fi
 
 next_part "Purging accounting records:"
 if [ -f /var/account/acct ]; then
-	mv -f /var/account/acct.2 /var/account/acct.3
-	mv -f /var/account/acct.1 /var/account/acct.2
-	mv -f /var/account/acct.0 /var/account/acct.1
+	test -f /var/account/acct.2 && \
+		mv -f /var/account/acct.2 /var/account/acct.3
+	test -f /var/account/acct.1 && \
+		mv -f /var/account/acct.1 /var/account/acct.2
+	test -f /var/account/acct.0 && \
+		mv -f /var/account/acct.0 /var/account/acct.1
 	cp -f /var/account/acct /var/account/acct.0
 	sa -sq
 	lastcomm -f /var/account/acct.0 | grep -e ' -[A-Z]*[PT]'