timers: remove useless check

loadvm_state is called from: vl.c during startup, vmstart() is called after finishing loading.  The other caller do_loadvm() does the call after a vm_stop().  At both places where we can be saving state we are stoped a few lines before

Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
