On the 'svnadmin-upgrade' branch, fix a copy-n-pasto.
* subversion/svnadmin/main.c
(subcommand_upgrade): Make one of the two checks for the
SVN_ERR_REPOS_UNSUPPORTED_UPGRADE error into a check for
SVN_ERR_FS_UNSUPPORTED_UPGRADE as originally intended.
Found by: glasser
git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/svnadmin-upgrade@869211 13f79535-47bb-0310-9956-ffa450edef68