Minor correction to yum invocation

agent/containers/images/gen-tags-from-rpm

@@ -29,7 +29,7 @@ name="${4}"
 # Ensure we only consider the pbench-agent RPM's version string from the
 # target repo.
 url="${url_prefix}/${name}/${dist}-${arch}"
-version_string="$(yum list -q --repofrompath pbench,"${url}" pbench-agent.noarch 2>/dev/null | awk 'FNR==2{print $2}')"
+version_string="$(yum list -q --repofrompath ${name},"${url}" pbench-agent.noarch 2>/dev/null | awk 'FNR==2{print $2}')"
 if [[ -z "${version_string}" ]]; then
     printf -- "Failed to fetch pbench-agent.noarch version string from '%s'\n" "${url}" >&2
     exit 1