protocol/server: server_stub_resume should check for failure of lookup when oldloc.parent is NULL.
protocol/server: server_stub_resume should check for failure of lookup when oldloc.parent is NULL.

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

BUG: 215 (crash on ib-verbs in 2.0.6-rc4)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=215

Kaushikbv/Gluster,Kaushikbv/Gluster,Kaushikbv/Gluster