Input: qt1070 - remove obsolete cleanup for clientdata

A few new i2c-drivers came into the kernel which clear the clientdata
pointer on exit or error. This is not required anymore since the core
will do it for us.

Signed-off-by: Wolfram Sang <[e-mail]>
Acked-by: Jean Delvare <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/keyboard/qt1070.c

···
 	input_unregister_device(data->input);
 	kfree(data);
 
-	i2c_set_clientdata(client, NULL);
-
 	return 0;
 }