ixgbe: fix variable set but not used warnings by gcc 4.6

Caught with gcc 4.6 -Wunused-but-set-variable

Remove unused napi_vectors variable.

Fix the use of reset_bit in ixgbe_reset_hw_X540()

Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Stephen Ko <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ixgbe/ixgbe_x540.c b/drivers/net/ixgbe/ixgbe_x540.c
index 3a89239..f2518b0 100644
--- a/drivers/net/ixgbe/ixgbe_x540.c
+++ b/drivers/net/ixgbe/ixgbe_x540.c
@@ -133,17 +133,17 @@
 	}
 
 	ctrl = IXGBE_READ_REG(hw, IXGBE_CTRL);
-	IXGBE_WRITE_REG(hw, IXGBE_CTRL, (ctrl | IXGBE_CTRL_RST));
+	IXGBE_WRITE_REG(hw, IXGBE_CTRL, (ctrl | reset_bit));
 	IXGBE_WRITE_FLUSH(hw);
 
 	/* Poll for reset bit to self-clear indicating reset is complete */
 	for (i = 0; i < 10; i++) {
 		udelay(1);
 		ctrl = IXGBE_READ_REG(hw, IXGBE_CTRL);
-		if (!(ctrl & IXGBE_CTRL_RST))
+		if (!(ctrl & reset_bit))
 			break;
 	}
-	if (ctrl & IXGBE_CTRL_RST) {
+	if (ctrl & reset_bit) {
 		status = IXGBE_ERR_RESET_FAILED;
 		hw_dbg(hw, "Reset polling failed to complete.\n");
 	}