use an unsigned 16-bit type for gain

+ Gain is documented and sent to the hardware as a value in the range 0 to
  65535, but the module parameter and sysfs attribute accept wider integer
  values. Store gain as a u16 and parse sysfs writes with kstrtou16 so
  out-of-range values are rejected instead of being silently changed.

+ This constrains only the configured value. Calculations combining gain
  values still require a wider intermediate to cover the product of two
  full-range 16-bit values.

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