g10: Simplify code: remove field struct getkey_ctx_s.keyblock.
* g10/getkey.c (struct getkey_ctx_s): Remove field keyblock. (finish_lookup): Add parameter keyblock. Update caller to pass this. (lookup): Add new local variable keyblock. Use this instead of ctx->keyblock for referencing the keyblock.
- Signed-off-by: Neal H. Walfield <neal@g10code.com>.