ixgbe: Add FW detection and warning for 82599 SFP+ adapters

82599 has a FW running that helps manage the internal SFI PHY.  There are
also a number of pre-production samples of these SFI-based devices in the
field.  This patch adds a check to look for the firmware running on all
SFP+ based adapters, and displays a warning to the system log if a
pre-production adapter is identified.  The driver will continue loading
though, with no functional degradation.

Also remove an old function prototype from ixgbe_82599.c that isn't being
used.

Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@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/ixgbe/ixgbe_common.c b/drivers/net/ixgbe/ixgbe_common.c
index db339d6..96a1859 100644
--- a/drivers/net/ixgbe/ixgbe_common.c
+++ b/drivers/net/ixgbe/ixgbe_common.c
@@ -106,13 +106,17 @@
  **/
 s32 ixgbe_init_hw_generic(struct ixgbe_hw *hw)
 {
+	s32 status;
+
 	/* Reset the hardware */
-	hw->mac.ops.reset_hw(hw);
+	status = hw->mac.ops.reset_hw(hw);
 
-	/* Start the HW */
-	hw->mac.ops.start_hw(hw);
+	if (status == 0) {
+		/* Start the HW */
+		status = hw->mac.ops.start_hw(hw);
+	}
 
-	return 0;
+	return status;
 }
 
 /**