vl: unify calls to init_timer_alarm

init_timer_alarm was being called twice.  This is not needed.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/main-loop.c b/main-loop.c
index e43c7c8..234a313 100644
--- a/main-loop.c
+++ b/main-loop.c
@@ -123,7 +123,10 @@
     GSource *src;
 
     init_clocks();
-    init_timer_alarm();
+    if (init_timer_alarm() < 0) {
+        fprintf(stderr, "could not initialize alarm timer\n");
+        exit(1);
+    }
 
     qemu_mutex_lock_iothread();
     ret = qemu_signal_init();