suppress unneeded error message

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@14167 71c3de6d-444a-0410-be80-ed276b4c234a

release-debian.sh

@@ -20,7 +20,7 @@ scp ../hudson_${ver}_all.deb hudson.gotdns.com:~/public_html_hudson/debian/binar
 
 # build package index
 pushd ..
-mkdir binary || true
+mkdir binary > /dev/null 2>&1 || true
 mv hudson_${ver}_all.deb binary
 dpkg-scanpackages binary /dev/null | gzip -9c > binary/Packages.gz
 scp binary/Packages.gz hudson.gotdns.com:~/public_html_hudson/debian/binary