opensp: `sgmlHookDone` can be undefined

+1 -1
+1 -1
pkgs/tools/text/sgml/opensp/setup-hook.sh
··· 6 6 fi 7 7 } 8 8 9 - if test -z "$sgmlHookDone"; then 9 + if test -z "${sgmlHookDone-}"; then 10 10 sgmlHookDone=1 11 11 12 12 # Set http_proxy and ftp_proxy to a invalid host to prevent