tor/changes/rsa_init_bug

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o Major bugfixes (key management):
- If OpenSSL fails to generate an RSA key, do not retain a dangling pointer
to the previous (uninitialized) key value. The impact here should be
limited to a difficult-to-trigger crash, if OpenSSL is running an
engine that makes key generation failures possible, or if OpenSSL runs
out of memory. Fixes bug 19152; bugfix on 0.2.1.10-alpha. Found by
Yuan Jochen Kang, Suman Jana, and Baishakhi Ray.