heimdal: Fix CID 240793 Uninitialized scalar variable

heimdal: Fix CID 240793 Uninitialized scalar variable

tmp.data is uninitialized in the fwrite call

Hopefully I don't create a problem here: If tmp.data is supposed to be randomly
set, I think the right fix would have been to explicitly call a random function
initializing it.

<jra@samba.org>
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I have looked through the code carefully. Your fix is safe.

The first entry in the replay file created in krb5_rc_initialize()
is only used to store the 'krb5_deltat auth_lifespan' value, the
associated data[16] value is never looked at. (Look at the
code in krb5_rc_store() and krb5_rc_get_lifespan() to confirm).

Only subsequent data[16] values are checked with memcmp.
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Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>