bos: Don't set up the conenction twice in AddKey

bos: Don't set up the conenction twice in AddKey

AddKey calls GetConn twice - once at the start of the function,
and then again immediately before calling BOZO_AddKey. This leaks
a connection...

Caught by clang-analyzer

Change-Id: I5c593de56e7f61fb21b973a34bea1a5b4f4a3177
Reviewed-on: http://gerrit.openafs.org/9230
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Chas Williams - CONTRACTOR <chas@cmf.nrl.navy.mil>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>