dmband: Indirection levels fix

[Robert Shearman]

Andrew Talbot wrote:
> diff --git a/dlls/dmband/band.c b/dlls/dmband/band.c
> index 891fb5a..8b89573 100644
> --- a/dlls/dmband/band.c
> +++ b/dlls/dmband/band.c
> @@ -173,7 +173,7 @@ static HRESULT WINAPI IDirectMusicBandImpl_IDirectMusicObject_SetDescriptor (LPD
>  		This->pDesc->ftDate = pDesc->ftDate;
>  	if (pDesc->dwValidData & DMUS_OBJ_MEMORY) {
>  		This->pDesc->llMemLength = pDesc->llMemLength;
> -		memcpy (This->pDesc->pbMemData, pDesc->pbMemData, sizeof (pDesc->pbMemData));
> +		memcpy (&This->pDesc->pbMemData, &pDesc->pbMemData, sizeof (pDesc->pbMemData));
>  	}
>  	if (pDesc->dwValidData & DMUS_OBJ_STREAM) {
>  		/* according to MSDN, we copy the stream */

This isn't correct. Judging by the surrounding code, this should be 
allocating a block of memory of This->pDesc->pbMemData and then passing 
pDesc->llMemLength into memcpy, possibly validating that 
pDesc->llMemLength isn't greater than UINT_MAX to avoid an overflow.

-- 
Rob Shearman