cluster/afr: Fix double-free in opendir self-heal callback.
cluster/afr: Fix double-free in opendir self-heal callback.

local->cont.opendir.checksum was being free'd both in the
self-heal completion function and self-heal unwind.

Signed-off-by: Vikas Gorur <vikas@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 249 (Self heal of a file that does not exist on the first subvolume)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=249

Kaushikbv/Gluster,Kaushikbv/Gluster,Kaushikbv/Gluster