greybus: pwm: fix config-request alignment

Fix alignment of the duty and period-fields in the config request,
which should follow the which-field without any inserted padding.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/staging/greybus/pwm.c

@@ -56,8 +56,8 @@ struct gb_pwm_deactivate_request {
 
 struct gb_pwm_config_request {
 	__u8	which;
-	__le32	duty;
-	__le32	period;
+	__le32	duty __packed;
+	__le32	period __packed;
 };
 
 struct gb_pwm_polarity_request {