crypt32: fix possible dereference of NULL ptr

[Jeff Latimer]

This patch fixes the situation where ext is null in the previous block. 
  If ext is null then nameAttr will be null.

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