Remove unused value
Remove unused value

Removes an unused value in the alerthandler.go file, shown
via lgtm.com.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <5f7133baa0f5c7ca63ff11e11f2e2b0d2cf077c8@gmail.com>

openfaas/faas,alexellis/faas,alexellis/faas,alexellis/faas,alexellis/faas,alexellis/faas,openfaas/faas,alexellis/faas,openfaas/faas,alexellis/faas,alexellis/faas,alexellis/faas