secur32: Work around ntlm_auth in Samba 3.0.28a being broken for cached credentials

[Kai Blin]

Samba 3.0.28a (as shipped with Ubuntu 8.04) seems to break when using
cached credentials backed by winbindd, returning a BH error in our test
if we still need to provide a password. Handle this and report a more
correct error.
---
 dlls/secur32/ntlm.c |   14 +++++++++++++-
 1 files changed, 13 insertions(+), 1 deletions(-)
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