[Toybox] [PATCH] memeater: fixes.

[enh]

The ULONG_MAX turns into -1 here, which isn't what was intended.
I'll avoid the bikeshed of the least worst full fix and take half
the range which is plenty for my purposes.

Also fix the array indexing to not segfault.
---
 toys/other/memeater.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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