meta-google: inplace-gbmc-update: Exit while updating

We don't want to accidentally notify or continue on with the DHCP
netboot process until after the updated image is installed.

Change-Id: I05504632950566694e9dd60b25bd85c99b588f90
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-google/recipes-phosphor/flash/inplace-gbmc-update/75-inplace-gbmc-upgrade.sh b/meta-google/recipes-phosphor/flash/inplace-gbmc-update/75-inplace-gbmc-upgrade.sh
index df4662f..95c4ca5 100644
--- a/meta-google/recipes-phosphor/flash/inplace-gbmc-update/75-inplace-gbmc-upgrade.sh
+++ b/meta-google/recipes-phosphor/flash/inplace-gbmc-update/75-inplace-gbmc-upgrade.sh
@@ -36,6 +36,9 @@
   systemctl start inplace-gbmc-verify || return
   echo 'Rebooting to perform update' >&2
   reboot || return
+  # Ensure that we don't "complete" the netboot process until
+  # after the update completes
+  exit 0
 }
 
 inplace_gbmc_upgrade=1