Eliminate some $? tests by rolling the command into the condition

ok halex@

src/etc/netstart

@@ -1,6 +1,6 @@
 #!/bin/sh -
 #
-#	$OpenBSD: netstart,v 1.132 2011/05/26 15:22:53 mpf Exp $
+#	$OpenBSD: netstart,v 1.133 2011/07/07 23:09:46 guenther Exp $
 
 # Strip comments (and leading/trailing whitespace if IFS is set)
 # from a file and spew to stdout
@@ -47,11 +47,9 @@ ifstart() {
 		chmod -LR o-rwx $file
 		chown -LR root.wheel $file
 	fi
-	ifconfig $if > /dev/null 2>&1
-	if [ "$?" != "0" ]; then
+	if ! ifconfig $if > /dev/null 2>&1; then
 		# Try to create interface if it does not exist
-		ifconfig $if create > /dev/null 2>&1
-		if [ "$?" != "0" ]; then
+		if ! ifconfig $if create > /dev/null 2>&1; then
 			return
 		fi
 	fi

src/etc/rc

@@ -1,4 +1,4 @@
-#	$OpenBSD: rc,v 1.363 2011/07/07 22:57:29 deraadt Exp $
+#	$OpenBSD: rc,v 1.364 2011/07/07 23:09:46 guenther Exp $
 
 # System startup script run by init on autoboot
 # or after single-user.
@@ -518,8 +518,7 @@ fi
 if [ ! -f /etc/motd ]; then
 	install -c -o root -g wheel -m 664 /dev/null /etc/motd
 fi
-T=`mktemp /tmp/_motd.XXXXXXXXXX`
-if [ $? -eq 0 ]; then
+if T=`mktemp /tmp/_motd.XXXXXXXXXX`; then
 	sysctl -n kern.version | sed 1q > $T
 	echo "" >> $T
 	sed '1,/^$/d' < /etc/motd >> $T

src/etc/weekly

@@ -1,5 +1,5 @@
 #
-#	$OpenBSD: weekly,v 1.24 2011/01/19 06:18:05 david Exp $
+#	$OpenBSD: weekly,v 1.25 2011/07/07 23:09:46 guenther Exp $
 #
 # For local additions, create the file /etc/weekly.local.
 # To get section headers, use the function next_part in weekly.local.
@@ -45,8 +45,7 @@ run_script "weekly.local"
 
 next_part "Rebuilding locate database:"
 if [ -f /var/db/locate.database ]; then
-	TMP=`mktemp /var/db/locate.database.XXXXXXXXXX`
-	if [ $? -eq 0 ]; then
+	if TMP=`mktemp /var/db/locate.database.XXXXXXXXXX`; then
 		trap 'rm -f $TMP; exit 1' 0 1 15
 		UPDATEDB="/usr/libexec/locate.updatedb"
 		echo "${UPDATEDB} --fcodes=- --tmpdir=${TMPDIR:-/var/tmp}" | \