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/usb/hso.c

@@ -1472,7 +1472,6 @@ static void hso_serial_set_termios(struct tty_struct *tty, struct ktermios *old)
 	spin_unlock_irqrestore(&serial->serial_lock, flags);
 
 	/* done */
-	return;
 }
 
 /* how many characters in the buffer */
@@ -1992,7 +1991,6 @@ static void hso_std_serial_write_bulk_callback(struct urb *urb)
 	hso_kick_transmit(serial);
 
 	D1(" ");
-	return;
 }
 
 /* called for writing diag or CS serial port */