[BUG] `git stash drop --help` removes stash

[Alexander Daniel <alexander.daniel@xxxxxxxxxxxxx>]

SUMMARY
`git stash drop --help` removes stash@{0}

VERSION
$ git --version
git version 1.7.10.2

STEPS TO REPRODUCE
- put something on the stash with `git stash`
- Naively try to show help for `git stash drop` with `git stash drop --help`
- `git stash drop --help` actually removes stash@{0}:

  $ git stash drop --help
  Dropped refs/stash@{0} (bfee7acd94b85e2b0bb5ef172893872140ba0520)

EXPECTED BEHAVIOR:
Invalid parameter error message is displayed (no modification of the stash)

Alex
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