r22950: Fix the issue Volker reported here :

r22950: Fix the issue Volker reported here :

"Attempt to fix some build farm failures: On port 139 the first
successful packet gives len==0 from the server, so the = in

        if (len <= 0) {

in line 136 of clientgen.c throws a failure."

The irritating thing is that I already had it correct in
SAMBA_3_0_26 and forgot to merge the change across.

len == 0 is a valid return - I messed that up when
converting client_receive_smb() to return a length
rather than a BOOL.

Doh !

Jeremy.
(This used to be commit a398bdf08d9efac51af28aed29f2c0f151cd5aad)