qmp: Clean up type usage in qmp_memchar_write(), qmp_memchar_read() Const-correctness, consistently use standard C types instead of mixing them with GLib types. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>