Fixed makefile

git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@563 f882894a-f735-0410-b71e-b25c423dba1c

doc/makefile

@@ -4,4 +4,5 @@ developer-guidelines.html: developer-guidelines.sgml
 	docbook2html -u developer-guidelines.sgml
 	if [[ -e developer-guidelines/developer-guidelines.html ]] ; then \
 		mv developer-guidelines/developer-guidelines.html . ;\
-	rm -f developer-guidelines ;\
+		rm -f developer-guidelines ;\
+	fi