cluster/afr: Use user-supplied struct flock to STACK_WIND
cluster/afr: Use user-supplied struct flock to STACK_WIND

afr_lk_cbk:
 Use the original struct flock supplied by the
 user to do further STACK_WIND's, and not the flock returned
 by the previous STACK_WIND.

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

BUG: 159 (Client hangs when coherent byte range locks is attempted in replicate setup)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=159

Kaushikbv/Gluster,Kaushikbv/Gluster,Kaushikbv/Gluster