Merge branch 'master' into next

* master:
  packed_object_info_detail(): check for corrupt packfile.
  cleanups: remove unused variable from exec_cmd.c
  cleanups: prevent leak of two strduped strings in config.c
  cleanups: Remove impossible case in quote.c
  cleanups: Remove unused vars from combine-diff.c
  cleanups: Fix potential bugs in connect.c
  Allow empty lines in info/grafts