parser: Fix handling of empty aliases

Dash was incorrectly handling empty aliases. When attempting to use an
empty alias with nothing else, I'm (incorrectly) prompted for more
input:

```
$ alias empty=''
$ empty
>
```

Other shells (e.g., bash, yash) correctly handle the lone, empty alias as an
empty command:

```
$ alias empty=''
$ empty
$
```

The problem here is that we incorrectly enter the loop eating TNLs
in readtoken().  This patch fixes it by setting checkkwd correctly.

Reported-by: Michael Greenberg <michael.greenberg@pomona.edu>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

0 files changed, 0 insertions, 0 deletions