abuild: fix issue in maintainer check

seems the maintainer variable is not set anymore when building .PKGINFO

abuild.in

@@ -210,7 +210,7 @@ default_sanitycheck() {
 	[ -n "$pkggroup" ] && spell_error pkggroup pkggroups
 	[ -n "$subpackage" ] && spell_error subpackage subpackages
 
-	get_maintainer || die "Provide a valid RFC822 maintainer address"
+	check_maintainer || die "Provide a valid RFC822 maintainer address"
 
 	makedepends_has 'g++' && warning "g++ should not be in makedepends"
 	return 0
@@ -721,25 +721,24 @@ git_last_commit() {
 	git log --format=oneline -n 1 "$startdir" | awk '{print $1}'
 }
 
-# this will try to check for a valid rfc822 address
-check_rfc822() {
-	local address="$1"
-	case "$address" in
-		*[A-Za-z0-9]*\ \<*@*.*\>) ;;
-		*) return 1 ;;
-	esac
-}
-
 get_maintainer() {
 	if [ -z "$maintainer" ]; then
 		maintainer=$(awk -F': ' '/\# *Maintainer/ {print $2}' "$APKBUILD")
 		# remove surrounding whitespace
 		maintainer=$(echo "$maintainer" | xargs)
-		if ! [ -z "$maintainer" ]; then
-			check_rfc822 "$maintainer" || return 1
-		else
-			warning "No maintainer"
 	fi
+}
+
+check_maintainer() {
+	get_maintainer
+	if [ -z "$maintainer" ]; then
+		warning "No maintainer"
+	else
+		# try to check for a valid rfc822 address
+		case "$maintainer" in
+			*[A-Za-z0-9]*\ \<*@*.*\>) ;;
+			*) return 1 ;;
+		esac
 	fi
 }
 
@@ -805,6 +804,7 @@ EOF
 	fi
 	echo "commit = $last_commit" >> "$pkginfo"
 
+	get_maintainer
 	if [ -n "$maintainer" ]; then
 		echo "maintainer = $maintainer" >> "$pkginfo"
 	fi