functionality. In function "wm8904_hw_reset" the priv->balance
is initialized with b16HALF, indicating a range from
0 to b16ONE. In function "wm8904_setvolume" the assumed
range for priv->balance is between 0 and 1000. The changes
now make this consistent for 0 to b16ONE-1. Furthermore,
in wm8904_configure the change of balance was not implemented.