[U-Boot] env: fix env var autocompletion

[Mike Frysinger]

On Monday, April 04, 2011 21:17:45 Kim Phillips wrote:
> commit 560d424b6d7cd4205b062ad95f1b104bd4f8bcc3 "env: re-add
> support for auto-completion" fell short of its description -
> the 'used' logic in hmatch_r was reversed - 'used' is 0 if
> the hash table entry is not used, or -1 if deleted.  This
> patch makes hmatch_r actually match on valid ('used') entries,
> instead of skipping them and failing to match anything.

i dont think my commit is wrong.  i think the bug you describe was actually 
added in c81c1222427f268d29ba999c82e2477c428e7bab.
-mike
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