secur32: Fix possible crash while loading SSP providers from registry.

[Huang, Zhangrong]

ChangeLog:
    secur32: Fix possible crash while loading SSP providers from registry.

-- 
$ apt-get moo
         (__)
         (oo)
   /------\/
  / |    ||
 *  /\---/\
    ~~   ~~
...."Have you mooed today?"...
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