avifil32: Fix some memory leaks

[Paul Vriens]

Andrew Talbot wrote:
> Paul Vriens wrote:
> 
>> Doesn't this mean that every one of those 4 mmio-calls are executed? In
>> the previous logic we would bail out after one failure.
>>
> 
> My reasoning is that short-circuit evaluation ensures that expressions are
> evaluated from left to right, and as soon as one evaluates as true, the
> whole "if" clause must be true, so the remaining statements are discarded.
> 

Yes I see now, sorry about the noise (there was something wrong with my own logic).

-- 
Cheers,

Paul.