Use memset to clear SRP_CTX instead of NULL and zero assignments
This uses memset() to clear all of the SRP_CTX when free'ing or initializing it as well as in error paths instead of having a series of NULL and zero assignments as it is safer. It also changes SSL_SRP_CTX_init() to reset all the SRP_CTX to zero in case or error, previously it could retain pointers to freed memory, potentially leading to a double free. Reviewed-by: Rich Salz <rsalz@openssl.org> Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/3467)
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