fix a crash in cleanup_and_exit ()
fix a crash in cleanup_and_exit ()

* fini() was being called without proper 'THIS' being set.
* in protocol/client, a frame was getting created after frame
  pool was destroyed

Signed-off-by: Amar Tumballi <amar@gluster.com>
Signed-off-by: Vijay Bellur <vijay@dev.gluster.com>

BUG: 1030 (mount directory is not unmounted after killing glusterfs process)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=1030

Kaushikbv/Gluster,Kaushikbv/Gluster,Kaushikbv/Gluster