drivers/net: Remove unnecessary returns from void function()s

This patch removes from drivers/net/ 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.

It also does not remove null void functions with return.

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; }'

with some cleanups by hand.

Compile tested x86 allmodconfig only.

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

drivers/net/hamradio/scc.c

@@ -1629,7 +1629,6 @@ static void scc_net_rx(struct scc_channel *scc, struct sk_buff *skb)
 	skb->protocol = ax25_type_trans(skb, scc->dev);
 	
 	netif_rx(skb);
-	return;
 }
 
 /* ----> transmit frame <---- */