ixgbe: improve logic in ixgbe_init_mbx_params_pf

Use if/then instead of an all-inclusive case statement.
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>

drivers/net/ixgbe/ixgbe_mbx.c

@@ -448,23 +448,20 @@ void ixgbe_init_mbx_params_pf(struct ixgbe_hw *hw)
 {
 	struct ixgbe_mbx_info *mbx = &hw->mbx;
 
-	switch (hw->mac.type) {
-	case ixgbe_mac_82599EB:
-	case ixgbe_mac_X540:
-		mbx->timeout = 0;
-		mbx->usec_delay = 0;
+	if (hw->mac.type != ixgbe_mac_82599EB &&
+	    hw->mac.type != ixgbe_mac_X540)
+		return;
 
-		mbx->size = IXGBE_VFMAILBOX_SIZE;
+	mbx->timeout = 0;
+	mbx->udelay = 0;
 
 	mbx->stats.msgs_tx = 0;
 	mbx->stats.msgs_rx = 0;
 	mbx->stats.reqs = 0;
 	mbx->stats.acks = 0;
 	mbx->stats.rsts = 0;
-		break;
-	default:
-		break;
-	}
+
+	mbx->size = IXGBE_VFMAILBOX_SIZE;
 }
 #endif /* CONFIG_PCI_IOV */