suspend: let errors be logged into journald

The \0 after error code prevent logging error message which is after it.
This change clobber qubesd-query exit code with tr exit code (mostly 0),
but this is a good thing - failing qubes-suspend service does not
prevent the suspend, but do prevent the stop hooks being called, which
for example breaks time synchronization or may leave some domains
paused.

QubesOS/qubes-issues#3489

pm-utils/52qubes-pause-vms

@@ -3,10 +3,10 @@
 case "$1" in
     suspend|hibernate)
         qubesd-query -e --fail -c /var/run/qubesd.internal.sock \
-            dom0 internal.SuspendPre dom0
+            dom0 internal.SuspendPre dom0 | tr '\0' ' '
         ;;
     resume|thaw)
         qubesd-query -e --fail -c /var/run/qubesd.internal.sock \
-            dom0 internal.SuspendPost dom0
+            dom0 internal.SuspendPost dom0 | tr '\0' ' '
         ;;
 esac