i2c: Make remove callback return void

The value returned by an i2c driver's remove function is mostly ignored.
(Only an error message is printed if the value is non-zero that the
error is ignored.)

So change the prototype of the remove function to return no value. This
way driver authors are not tempted to assume that passing an error to
the upper layer is a good idea. All drivers are adapted accordingly.
There is no intended change of behaviour, all callbacks were prepared to
return 0 before.

Reviewed-by: Peter Senna Tschudin <[email protected]>
Reviewed-by: Jeremy Kerr <[email protected]>
Reviewed-by: Benjamin Mugnier <[email protected]>
Reviewed-by: Javier Martinez Canillas <[email protected]>
Reviewed-by: Crt Mori <[email protected]>
Reviewed-by: Heikki Krogerus <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
Acked-by: Marek Behún <[email protected]> # for leds-turris-omnia
Acked-by: Andy Shevchenko <[email protected]>
Reviewed-by: Petr Machata <[email protected]> # for mlxsw
Reviewed-by: Maximilian Luz <[email protected]> # for surface3_power
Acked-by: Srinivas Pandruvada <[email protected]> # for bmc150-accel-i2c + kxcjk-1013
Reviewed-by: Hans Verkuil <[email protected]> # for media/* + staging/media/*
Acked-by: Miguel Ojeda <[email protected]> # for auxdisplay/ht16k33 + auxdisplay/lcd2s
Reviewed-by: Luca Ceresoli <[email protected]> # for versaclock5
Reviewed-by: Ajay Gupta <[email protected]> # for ucsi_ccg
Acked-by: Jonathan Cameron <[email protected]> # for iio
Acked-by: Peter Rosin <[email protected]> # for i2c-mux-*, max9860
Acked-by: Adrien Grassein <[email protected]> # for lontium-lt8912b
Reviewed-by: Jean Delvare <[email protected]> # for hwmon, i2c-core and i2c/muxes
Acked-by: Corey Minyard <[email protected]> # for IPMI
Reviewed-by: Vladimir Oltean <[email protected]>
Acked-by: Dmitry Torokhov <[email protected]>
Acked-by: Sebastian Reichel <[email protected]> # for drivers/power
Acked-by: Krzysztof Hałasa <[email protected]>
Signed-off-by: Uwe Kleine-König <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>

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