Fix uninitialised variable warning

[Nathan Sidwell]

Geoff Keating wrote:

>>Btw, out of curiosity, what's the difference between initializing with 
>>-1 vs 0?
> 
> 
> I picked -1 because I thought it would be better if the checksum was
> unlikely to match if it wasn't ever initialised.
I don't think it is used uninitialized, no matter how
screwed the counts file, because there's an
additional check that function_name_buffer must be non-null. (But
of course, your patch is fins as it stops the warning.)

nathan

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          The voices in my head said this was stupid too
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