[roll] Roll fuchsia [kernel][userboot] Print status when kickoff message fails

Print the returned status code when sending the kickoff message to
userboot fails. This will help diagnose why the kickoff message is
failing.

Original-Bug: b/417302004
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1274605
Original-Revision: 8b3bffa3262da92aa3cbcca113d119267659147f
GitOrigin-RevId: 67894bc3f844f9e19220e283eb412151f3e1f329
Change-Id: I5bb8fb783052c1da0da526c1a5eb6ada803a4add
diff --git a/stem b/stem
index ebd1c79..5544810 100644
--- a/stem
+++ b/stem
@@ -8,7 +8,7 @@
              root=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="257585cb22eea3f9369bda24223427d9ee7e483c"
+             revision="8b3bffa3262da92aa3cbcca113d119267659147f"
              />
   </imports>
   <projects>