net: hsr: Add __packed to struct hsr_sup_tlv.

Struct hsr_sup_tlv describes HW layout and therefore it needs a __packed
attribute to ensure the compiler does not add any padding.
Due to the size and __packed attribute of the structs that use
hsr_sup_tlv it has no functional impact.

Add __packed to struct hsr_sup_tlv.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/hsr/hsr_main.h

@@ -83,7 +83,7 @@ struct hsr_vlan_ethhdr {
 struct hsr_sup_tlv {
 	u8		HSR_TLV_type;
 	u8		HSR_TLV_length;
-};
+} __packed;
 
 /* HSR/PRP Supervision Frame data types.
  * Field names as defined in the IEC:2010 standard for HSR.