[PATCH] fix global bash variable on __gitcompappend

["Márcio Almada" <marcio.web2@gmail.com>]

Hi,

This is how to reproduce the bug:

```
git checkout [tab-tab]
echo $x # outputs the name of the last branch on completion list
```

Or more directly:

```
__gitcompappend "something"
echo $x # outputs 'something'
```

Might not be a big deal, but it's annoying to know that `$x` is lurking.

Márcio Almada (1):
  fix global bash variable leak on __gitcompappend

 contrib/completion/git-completion.bash | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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1.9.3