Memory leaks in key generation

[Tomas Mraz]

The attached patch fixes a few possible memory leaks in
gnutls_x509_privkey_generate()

First one happens always when RSA key is generated using the libgcrypt
backend.

The remaining ones are rather theoretical only when some error paths are
taken.

The problem was reported to Red Hat Bugzilla by Sam Varshavchik.

-- 
Tomas Mraz
No matter how far down the wrong road you've gone, turn back.
                                              Turkish proverb
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