client_t: fix for potential NULL pointer dereference

In case an error occurs, 'client' is free'd. The log message just before
exiting the function should therefore not use the structure anymore.

BUG: 789278
Change-Id: I0848328b29585057cd037a5972c4e5f06a7f978b
CID: 1226165
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Reviewed-on: http://review.gluster.org/9262
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>