qlge: remove duplicated #include

Remove duplicated #include('s) in
  drivers/net/qlge/qlge_main.c
Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/qlge/qlge_main.c

@@ -36,7 +36,6 @@
 #include <linux/ethtool.h>
 #include <linux/if_vlan.h>
 #include <linux/skbuff.h>
-#include <linux/if_vlan.h>
 #include <linux/delay.h>
 #include <linux/mm.h>
 #include <linux/vmalloc.h>