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/cs89x0.c

@@ -902,7 +902,6 @@ get_dma_channel(struct net_device *dev)
 			return;
 		}
 	}
-	return;
 }
 
 static void
@@ -1672,7 +1671,6 @@ count_rx_errors(int status, struct net_local *lp)
 		/* per str 172 */
 		lp->stats.rx_crc_errors++;
 	if (status & RX_DRIBBLE) lp->stats.rx_frame_errors++;
-	return;
 }
 
 /* We have a good packet(s), get it/them out of the buffers. */