[VLAN]: Avoid expensive divides

[Eric Dumazet <dada1@cosmosbay.com>]

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We can avoid divides (as seen with CONFIG_CC_OPTIMIZE_FOR_SIZE=y on x86)
changing vlan_group_get_device()/vlan_group_set_device()  id parameter 
from signed to
unsigned.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>


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diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 976d4b1..4562105 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -81,14 +81,16 @@ struct vlan_group {
 	struct rcu_head		rcu;
 };
 
-static inline struct net_device *vlan_group_get_device(struct vlan_group *vg, int vlan_id)
+static inline struct net_device *vlan_group_get_device(struct vlan_group *vg,
+						       unsigned int vlan_id)
 {
 	struct net_device **array;
 	array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
 	return array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN];
 }
 
-static inline void vlan_group_set_device(struct vlan_group *vg, int vlan_id,
+static inline void vlan_group_set_device(struct vlan_group *vg,
+					 unsigned int vlan_id,
 					 struct net_device *dev)
 {
 	struct net_device **array;