ixgbevf: declare functions as static

Following patch fixes warnings reported by `make namespacecheck`

Reported by Stephen Hemminger

CC: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Acked-by: Greg Rose <greg.v.rose@intel.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ixgbevf/mbx.c b/drivers/net/ixgbevf/mbx.c
index b814350..84ac486 100644
--- a/drivers/net/ixgbevf/mbx.c
+++ b/drivers/net/ixgbevf/mbx.c
@@ -308,7 +308,7 @@
  *
  *  Initializes the hw->mbx struct to correct values for vf mailbox
  */
-s32 ixgbevf_init_mbx_params_vf(struct ixgbe_hw *hw)
+static s32 ixgbevf_init_mbx_params_vf(struct ixgbe_hw *hw)
 {
 	struct ixgbe_mbx_info *mbx = &hw->mbx;