agent: Fix alignment problem with the second passphrase struct.
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Description

agent: Fix alignment problem with the second passphrase struct.

* agent/genkey.c (agent_ask_new_passphrase): Use a separate malloc for
PI2.  Check return value of the malloc function.
* agent/command-ssh.c (ssh_identity_register): Use a separate malloc
for PI2.  Wipe PI2.

For whatever stupid reasons I once allocated only one memory area and
split that into PI and PI2. This is actually a common pattern with
malloc but here we used a made up object size and do not take the
extra alignment required into account. One of these not yet hit by
a (sig)bus PC/VAX hacker bugs.

Instead of trying to fix the alignment, it is better to use a second
calloc for the second struct.

Resolved conflicts:
agent/command-ssh.c
agent/genkey.c

(backport master commit ddf9dd135acd2b3635bb986f6dfc0e4e446d5fad)