libhb: fix incorrect sizeof()
Function parameter array declarations are not treated the same way
as local or global array declarations.  sizeof will return only the size
of the pointer instead of the size of the array.


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5584 b64f7644-9d1e-0410-96f1-a4d463321fa5