crypt32: [resend] fix possible dereference of NULL ptr

[Jeff Latimer]

This fixes the problem that at line 883 CertFindExtension can return 
NULL which makes ext possibly NULL.  As we are only here because 
nameAttr is NULL at line 881, the the call to CertRDNValueToStrW at line 
902 could be using NULL as a ptr.

Jeff
---
  dlls/crypt32/str.c |    5 +++--
  1 files changed, 3 insertions(+), 2 deletions(-)
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