Fix double-free in OpenSSL's SSL ECDH code.
Fix double-free in OpenSSL's SSL ECDH code.

It has yet to be determined if this warrants a FreeBSD Security
Advisory, but we might as well get it fixed in the normal branches.

Obtained from:	OpenSSL CVS
Security:	CVE-2010-2939
X-MFC after:	Not long...

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