Memory leak in 2.xx

[Sam Varshavchik]

In 2.12.14 _rsa_generate_params() has a stray "tmp = _gnutls_mpi_alloc_like  
(resarr[0]);". The malloc-ed memory never gets freed.

Looks like this code is gone in 3.x, so only 2.x is impacted.

This is called from gnutls_x509_privkey_generate(). A long-running  
application that keeps creating private keys, for temporary use, and  
destroying them after use, will end up leaking memory. This is also in the  
code path for temporary RSA parameter generation when using export-grade RSA  
keys. This will also leak memory.

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