Re-enable rx connection hard timeout

Re-enable rx connection hard timeout

A missing "conn->" in rxi_CheckCall prevents checking hard connection timeouts.

Change-Id: I893a1ba71957e2a830029dfc4e3ac51fa461d6ca
Reviewed-on: http://gerrit.openafs.org/3677
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Jeffrey Altman <jaltman@openafs.org>