Stop flooding the kernel's message ring buffer with useless
messages on dual_timestamp_is_set is failed.  This is a backport
from upstream code.

---
 src/libsystemd/sd-event/sd-event.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

--- systemd-210/src/libsystemd/sd-event/sd-event.c
+++ systemd-210/src/libsystemd/sd-event/sd-event.c	2014-05-02 10:01:23.366235185 +0000
@@ -2191,9 +2191,12 @@ _public_ int sd_event_exit(sd_event *e,
 _public_ int sd_event_get_now_realtime(sd_event *e, uint64_t *usec) {
         assert_return(e, -EINVAL);
         assert_return(usec, -EINVAL);
-        assert_return(dual_timestamp_is_set(&e->timestamp), -ENODATA);
         assert_return(!event_pid_changed(e), -ECHILD);
 
+        /* If we haven't run yet, just get the actual time */
+        if (!dual_timestamp_is_set(&e->timestamp))
+                return -ENODATA;
+
         *usec = e->timestamp.realtime;
         return 0;
 }
@@ -2201,9 +2204,12 @@ _public_ int sd_event_get_now_realtime(s
 _public_ int sd_event_get_now_monotonic(sd_event *e, uint64_t *usec) {
         assert_return(e, -EINVAL);
         assert_return(usec, -EINVAL);
-        assert_return(dual_timestamp_is_set(&e->timestamp), -ENODATA);
         assert_return(!event_pid_changed(e), -ECHILD);
 
+        /* If we haven't run yet, just get the actual time */
+        if (!dual_timestamp_is_set(&e->timestamp))
+                return -ENODATA;
+
         *usec = e->timestamp.monotonic;
         return 0;
 }