* in get_crypto_default_rng() (linuxkm/lkcapi_sha_glue.c), sanity check that crypto_default_rng isn't null; * in wc_InitRsaKey_ex(), remove frivolous NULL/zero assignments (XMEMSET clears them implicitly); * in wc_CheckRsaKey(), check ret from wc_InitRng() and short circuit return if failed.