app-backup/burp: make sure oldver is local to pkg_postinst()

Package-Manager: Portage-2.3.3, Repoman-2.3.1

app-backup/burp/burp-2.0.54.ebuild

@@ -94,6 +94,7 @@ pkg_postinst() {
 
 	# According to PMS this can be a space-separated list of version
 	# numbers, even though in practice it is typically just one.
+	local oldver
 	for oldver in ${REPLACING_VERSIONS}; do
 		if [[ $(get_major_version ${oldver}) -lt 2 ]]; then
 			ewarn "Starting with version 2.0.54 we no longer patch bedup to use"