ixgbe: Resolve warnings for -Wimplicit-fallthrough

This patch adds/changes fall through comments to address new warnings
produced by gcc 7.

Fixed formatting on a couple of comments in the function.

Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
index 13c96a1..e2766da 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
@@ -540,16 +540,15 @@ static s32 ixgbe_set_vf_lpe(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
 		case ixgbe_mbox_api_11:
 		case ixgbe_mbox_api_12:
 		case ixgbe_mbox_api_13:
-			/*
-			 * Version 1.1 supports jumbo frames on VFs if PF has
+			/* Version 1.1 supports jumbo frames on VFs if PF has
 			 * jumbo frames enabled which means legacy VFs are
 			 * disabled
 			 */
 			if (pf_max_frame > ETH_FRAME_LEN)
 				break;
+			/* fall through */
 		default:
-			/*
-			 * If the PF or VF are running w/ jumbo frames enabled
+			/* If the PF or VF are running w/ jumbo frames enabled
 			 * we need to shut down the VF Rx path as we cannot
 			 * support jumbo frames on legacy VFs
 			 */