main/djbdns: make sure there are valid ip address in @ before overwrite

main/djbdns/APKBUILD

 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=djbdns
 pkgver=1.05
-pkgrel=35
+pkgrel=37
 pkgdesc="Excellent high-performance DNS services"
 url="http://cr.yp.to/djbdns.html"
 license="public-domain"
@@ -101,4 +101,4 @@ fe48165a920cf843ceb9a4ee50bf74c0  tinydns.initd
 e09c3a6ba6917e16f4736ab5c070dbe9  dnscache.pre-install
 e5cada3b032da84c4a0e41ef8b3108cb  dnscache.initd
 2b3d02e88f70603c760bf368ab3ed636  dnscache.confd
-805b6989f945d727788f1908fe3fce81  dnscache.monthly"
+8173f85e0d9b4496de389d1b43993d95  dnscache.monthly"

main/djbdns/dnscache.monthly

@@ -19,7 +19,7 @@ for ZONEFILE in $ZONES; do
 		cp -f "$DST" "$ZONEFILE"
 	fi
 
-	if [ "$ZONE" == "@" ]; then
+	if [ "$ZONE" = "@" ]; then
 		ZONE="."
 	fi
 
@@ -28,9 +28,7 @@ for ZONEFILE in $ZONES; do
 	
 		# Refresh zone info
 		dnsqr ns $ZONE | awk '/^answer: ./ { print $5 }' | sort -u | xargs dnsip > $TMPF
-
-		grep "^$" $TMPF 1> /dev/null
-		if [ $? != 0 ]; then
+		if egrep -q '[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+' $TMPF; then
 			cmp -s $ZONEFILE $TMPF
 			if [ "$?" != 0 ]; then
 				NEEDRESTART=yes