rx: don't leak a connection hash table in unlikely error condition

rx: don't leak a connection hash table in unlikely error condition

If getsockname() returns an error (which shouldn't be possible),
rx_InitHost would leak a connection hash table (which probably
doesn't matter because the caller will just exit anyway).  Make
the analyzer happy by freeing the memory anyway.

Change-Id: If8e78ebfb787d2dc1c0b9f95f91b6e7510c9e307
Reviewed-on: http://gerrit.openafs.org/7768
Reviewed-by: Derrick Brashear <shadow@dementix.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>