protocol/server: eliminate an unnecessary frame create and destroy

connection_cleanup creates a frame solely so that it can be copied.

But the process of copying creates a new frame, and there's nothing
apparently magic about the one being copied; we can eliminate an
unnecessary create and destroy.

Which in the grand scheme of things probably isn't the worst thing
we do, but it's low hanging fruit.

Change-Id: I4a23b84a53e086137b7d4167ad8c20b673d1ffe5
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>
Reviewed-on: http://review.gluster.org/6019
Reviewed-by: Amar Tumballi <amarts@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>