meta-facebook: fix up new shellcheck warnings
New docker container is flagging some issues in this shell script:
```
SC2004 (style): $/${} is unnecessary on arithmetic variables.
SC2317 (info): Com
meta-facebook: fix up new shellcheck warnings
New docker container is flagging some issues in this shell script:
```
SC2004 (style): $/${} is unnecessary on arithmetic variables.
SC2317 (info): Command appears to be unreachable. Check usage (or ignore if invoked indirectly).
```
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: I9806a097ca417d8677374efd666f2a8865a0a2fd
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