Exit with an error message if git checkout $DEV_BRANCH fails.

This can happen for instance in stacked backports, if the user
didn't answer 'Y' when prompted to create a backport branch
during the backport of the previous patch.

Change-Id: I5ba0929c15727a904fdaae14880eada49600428f

1 files changed, 4 insertions, 0 deletions

diff --git a/backflip b/backflip
index b3dd49c..6eb6451 100755
--- a/backflip
+++ b/backflip
@@ -225,6 +225,10 @@ fi
 print_step "Cherry-picking Revision"
 # ==============================================================================
 git checkout $DEV_BRANCH
+if [ $? -ne 0 ]; then
+  print_info "Cannot checkout $DEV_BRANCH branch"
+  clean 1
+fi
 git cherry-pick -n $SHA1 2>/dev/null
 
 # ==============================================================================