CBQE-0: verify_src variable not in use after http://review.couchbase.org/#/c/37055/, removing it

Change-Id: Ib8feeb98dd07276a1c5652deb0631791de2e63f1
Reviewed-on: http://review.couchbase.org/41015
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>