s390x: sck: load into a temporary not into in1

s390x: sck: load into a temporary not into in1

We previously loaded into in1, but in1 is not filled during
disassembly and hence always zero. This leads to an assertion failure:

  qemu-system-s390x: /home/nrb/qemu/include/tcg/tcg.h:654: temp_idx:
  Assertion `n >= 0 && n < tcg_ctx->nb_temps' failed.`

Instead, use in2_la2_m64a to load from storage into in2 and pass that to
the helper, which matches what we already do for SCKC.

This fixes the SCK test I sent here under TCG:
<https://www.spinics.net/lists/kvm/msg265169.html>

Fixes: 9dc67537 ("s390x/tcg: implement SET CLOCK ")
Suggested-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
Message-Id: <20220126084201.774457-1-nrb@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>