net: Remove unnecessary returns from void function()s

This patch removes from net/ (but not any netfilter files)
all the unnecessary return; statements that precede the
last closing brace of void functions.

It does not remove the returns that are immediately
preceded by a label as gcc doesn't like that.

Done via:
$ grep -rP --include=*.[ch] -l "return;\n}" net/ | \
  xargs perl -i -e 'local $/ ; while (<>) { s/\n[ \t\n]+return;\n}/\n}/g; print; }'

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/decnet/dn_dev.c

@@ -1220,17 +1220,14 @@ void dn_dev_down(struct net_device *dev)
 
 void dn_dev_init_pkt(struct sk_buff *skb)
 {
-	return;
 }
 
 void dn_dev_veri_pkt(struct sk_buff *skb)
 {
-	return;
 }
 
 void dn_dev_hello(struct sk_buff *skb)
 {
-	return;
 }
 
 void dn_dev_devices_off(void)