We're seeing a crash in libcurl with the Windows system LDAP support
built in, where libcurl will attempt to free memory twice when a URL
parse fails.

This can be reproduced consistently using the command line tool with the
following URL:

"ldap://www.trustcenter.de/CN=TC%20TrustCenter%20Class%203%20CA%20II,O=TC%20TrustCenter%20GmbH,OU=rootcerts,DC=trustcenter,DC=de?certificateRevocationList?base?"

Windows is the only platform where we've seen the crash. We've tested
the attached patch on Mac OS X, 32-bit Windows and 64-bit Windows.

I believe I've followed the instructions for patch formatting and such,
but if I've gotten something wrong please let me know.

Thanks,

Geoff

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