RT2513: Fix typo's paramter-->parameter

I also found a couple of others (padlock and signinit)
and fixed them.

Reviewed-by: Emilia Kasper <emilia@openssl.org>
RT2848: Remove extra NULL check

Don't need to check auth for NULL since we did when we
assigned to it.

Reviewed-by: Emilia Kasper <emilia@openssl.org>
RT2847: Don't "check" uninitialized memory

Don't check err variable until after it's been set.

Reviewed-by: Emilia Kasper <emilia@openssl.org>