include: uapi: serial: fix serial_rs485 padding after adding ns delays

Fix in serial_rs485 struct, padding after adding delay_rts_before_send_ns
and delay_rts_after_send_ns. Padding should be decreased by 2 to keep
backward compatibility.

Fixes: 312bd2d ("include: uapi: serial: add support of rts delays in nanoseconds")

Signed-off-by: Borut Seljak <borut.seljak@t-2.net>
Signed-off-by: Valentin Caron <valentin.caron@foss.st.com>
Change-Id: Ife838ecf8ea68740140a62179fa1b6174705ab42
Reviewed-on: https://gerrit.st.com/c/mpu/oe/st/linux-stm32/+/235233
Tested-by: Amelie DELAUNAY <amelie.delaunay@foss.st.com>
Reviewed-by: Amelie DELAUNAY <amelie.delaunay@foss.st.com>
Reviewed-by: CITOOLS <MDG-smet-aci-reviews@list.st.com>
Reviewed-by: CIBUILD <MDG-smet-aci-builds@list.st.com>

Author: VCASTM

include/uapi/linux/serial.h

@@ -130,7 +130,7 @@ struct serial_rs485 {
 	__u32	delay_rts_after_send;	/* Delay after send (milliseconds) */
 	__u32	delay_rts_before_send_ns;	/* Delay (nanoseconds) */
 	__u32	delay_rts_after_send_ns;	/* Delay (nanoseconds) */
-	__u32	padding[5];		/* Memory is cheap, new structs
+	__u32	padding[3];		/* Memory is cheap, new structs
 					   are a royal PITA .. */
 };