Correct version test for migration in Debian packaging (#278)

build/lemonldap-ng/debian/liblemonldap-ng-conf-perl.postinst

@@ -20,7 +20,8 @@ then
 		db_get liblemonldap-ng-conf-perl/$i || true
 		perl -000 -i -pe "s#^$i(\\n\\s+)('?)[^\\n]*?('?)\$#$i\${1}\${2}$RET\${3}#m" $FIRSTCONFFILE
 	done
-	if [ `echo $2|sed -e 's/^0\.9.*$/X/'` = "X" ]; then
+	testversion=`echo $2|sed -e 's/^0\.9.*$/X/'`
+	if [ "$testversion" = "X" ]; then
 		if [ -e $CONFDIR/storage.conf -o -e $CONFDIR/apply.conf -o -e $CONFDIR/apps-list.xml ] ; then
 			db_get liblemonldap-ng-conf-perl/migrate
 			if [ "$RET" ]; then