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/wimax/i2400m/netdev.c

@@ -255,7 +255,6 @@ void i2400m_net_wake_stop(struct i2400m *i2400m)
 		kfree_skb(wake_tx_skb);
 	}
 	d_fnend(3, dev, "(i2400m %p) = void\n", i2400m);
-	return;
 }
 
 
@@ -434,7 +433,6 @@ void i2400m_tx_timeout(struct net_device *net_dev)
 	 * this, there might be data pending to be sent or not...
 	 */
 	net_dev->stats.tx_errors++;
-	return;
 }