The called runtime function never returns, thus we don't need to emit
return code afterwards.

R=ahaas@chromium.org

Change-Id: I4adb5492b1d5bcb8f644f9544137e07196ac61e4
Reviewed-on: https://chromium-review.googlesource.com/456507Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43972}