vmxnet3: using csum_ipv6_magic requires including net/ip6_checksum.h

Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/vmxnet3/vmxnet3_drv.c

@@ -24,6 +24,8 @@
  *
  */
 
+#include <net/ip6_checksum.h>
+
 #include "vmxnet3_int.h"
 
 char vmxnet3_driver_name[] = "vmxnet3";