i2c: Make the return type of i2c_del_mux_adapter() void

i2c_del_mux_adapter always returns 0 and none of it current users check its
return value anyway. It is also an essential requirement of the Linux device
driver model, that functions which may be called from a device's remove callback
to free resources provided by the device, are not allowed to fail. This is the
case for i2c_del_mux_adapter(), so make its return type void to make the
fact that it won't fail explicit.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Reviewed-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/i2c-mux.c

@@ -191,14 +191,12 @@ struct i2c_adapter *i2c_add_mux_adapter(struct i2c_adapter *parent,
 }
 EXPORT_SYMBOL_GPL(i2c_add_mux_adapter);
 
-int i2c_del_mux_adapter(struct i2c_adapter *adap)
+void i2c_del_mux_adapter(struct i2c_adapter *adap)
 {
 	struct i2c_mux_priv *priv = adap->algo_data;
 
 	i2c_del_adapter(adap);
 	kfree(priv);
-
-	return 0;
 }
 EXPORT_SYMBOL_GPL(i2c_del_mux_adapter);
 

include/linux/i2c-mux.h

@@ -42,7 +42,7 @@ struct i2c_adapter *i2c_add_mux_adapter(struct i2c_adapter *parent,
 				int (*deselect) (struct i2c_adapter *,
 						 void *mux_dev, u32 chan_id));
 
-int i2c_del_mux_adapter(struct i2c_adapter *adap);
+void i2c_del_mux_adapter(struct i2c_adapter *adap);
 
 #endif /* __KERNEL__ */