iser-target: Fix wrong allocation in the case of an empty text message
iser-target: Fix wrong allocation in the case of an empty text message

if text message dlength is 0, don't allocate a buffer for it, pass
NULL to iscsit_process_text_cmd.

Signed-off-by: Sagi Grimberg <380ce2a82d3d08e67ab163b51dc6d30288ad3f13@mellanox.com>
Signed-off-by: Nicholas Bellinger <978acd1567d5598152161fdf8bf3ca568f950c9b@linux-iscsi.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs