[omniORB] Patch to fix leak in SSL context initialization

[Peter Klotz]

Hello

Initializing and destroying an SSL enabled omniORB in a loop results in 
memory leaks because the SSL context string parameters are allocated but 
never freed.

These 3 lines in sslTransportImpl.cc cause the problem:

      sslContext::certificate_authority_file = CORBA::string_dup(value);
      sslContext::key_file = CORBA::string_dup(value);
      sslContext::key_file_password = CORBA::string_dup(value);

The attached patch against omniORB 4.1.4 simply calls 
CORBA::string_free() before allocating the new value.

Since all values are zero initialized on startup the fix should be safe.

Regards, Peter.
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