hlr.c: fix: properly print the original message type in read_cb_forward()

Printing 'OSMO_GSUP_MSGT_E_ROUTING_ERROR' in routing error messages
instead of the original message type may be confusing. Let's store
the original message type, and change just before sending.

Fix for Change-Id: Ia4f345abc877baaf0a8f73b8988e6514d9589bf5
Change-Id: Ic1db1e089fc0f8e03653a9f05058e95d2adaee39
1 file changed