avifil32: Fix some memory leaks

[Paul Vriens]

Andrew Talbot wrote:
> Changelog:
>     avifil32: Fix some memory leaks.
> 
>  
> -    if (mmioSeek(This->paf->hmmio, This->paf->dwNextFramePos, SEEK_SET) == -1)
> -      return AVIERR_FILEWRITE;
> -    if (mmioCreateChunk(This->paf->hmmio, &ck, 0) != S_OK)
> -      return AVIERR_FILEWRITE;
> -    if (mmioWrite(This->paf->hmmio, (HPSTR)lppc, ck.cksize) != ck.cksize)
> -      return AVIERR_FILEWRITE;
> -    if (mmioAscend(This->paf->hmmio, &ck, 0) != S_OK)
> +    if (mmioSeek(This->paf->hmmio, This->paf->dwNextFramePos, SEEK_SET) == -1 ||
> +        mmioCreateChunk(This->paf->hmmio, &ck, 0) != S_OK ||
> +        mmioWrite(This->paf->hmmio, (HPSTR)lppc, ck.cksize) != ck.cksize ||
> +        mmioAscend(This->paf->hmmio, &ck, 0) != S_OK)
> +    {

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.

-- 
Cheers,

Paul.