Correctly forward error code when git pull fails in crup-runner.sh

The old code would always exit 0, because it returned the exit status of the if command

BUG=none
TEST=try to run git crup in src/ with unstaged changes. Should bail out and not run hooks
R=szager@chromium.org


Review URL: https://chromiumcodereview.appspot.com/12040046

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@178356 0039d316-1c4b-4281-b951-d872f2087c98

crup-runner.sh

@@ -79,8 +79,9 @@ if [ "$solution" = "$1" ]; then
   fi
   shift 2
   $first_args $@ | sed "s/^/[$solution] /g" 1>&2
-  if [ $? -ne 0 ]; then
-    exit $?
+  status=$?
+  if [ "$status" -ne 0 ]; then
+    exit $status
   fi
 
   set_target_os