Merge branch 'en/sequencer-rollback-lock-cleanup'

Code clean-up.

* en/sequencer-rollback-lock-cleanup:
  sequencer: remove duplicate rollback_lock_file() call

Author: gitster

sequencer.c

@@ -3691,7 +3691,6 @@ static int do_merge(struct repository *r,
 				NULL, 0);
 		rollback_lock_file(&lock);
 
-		rollback_lock_file(&lock);
 		ret = run_command(&cmd);
 
 		/* force re-reading of the cache */