replicate: fix missing frame in entry-self-heal
replicate: fix missing frame in entry-self-heal

when files on all backend nodes are missing, the logic in afr_sh_entry_erase_pending
is broken and results in missing lookup frame. this causes processes to enter into
uninterruptible sleep state.

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

BUG: 311 (missing frame (lookup) when entry-selfheal finds missing files in all backend nodes)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=311

Kaushikbv/Gluster,Kaushikbv/Gluster,Kaushikbv/Gluster