secur32: Fix ntlm_GetCachedCredential to not call strlenW on a NULL pointer.

[Robert Shearman]

pszHost should just be set to pszTargetName if pszTargetName doesn't 
contain any other information.
---
  dlls/secur32/ntlm.c |    3 +++
  1 files changed, 3 insertions(+), 0 deletions(-)
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