So that it rounds to integral audio frame count.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=52225Signed-off-by: Rémi Bernon <rbernon@codeweavers.com>
Signed-off-by: Andrew Eikum <aeikum@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>