There is no call to platform_get_drvdata() or dev_get_drvdata().
Drop the unnecessary call to platform_set_drvdata().

Also use existing variable 'dev' instead of dereferencing it several times.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>