igb: Cleanups to fix missing break in switch statements

This patch fixes WARNING:MISSING_BREAK found with checkpatch check.

Signed-off-by: Carolyn Wyborny <carolyn.wyborny@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 6469f97..9762239 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -726,12 +726,14 @@
 				adapter->rx_ring[i]->reg_idx = rbase_offset +
 							       Q_IDX_82576(i);
 		}
+		/* Fall through */
 	case e1000_82575:
 	case e1000_82580:
 	case e1000_i350:
 	case e1000_i354:
 	case e1000_i210:
 	case e1000_i211:
+		/* Fall through */
 	default:
 		for (; i < adapter->num_rx_queues; i++)
 			adapter->rx_ring[i]->reg_idx = rbase_offset + i;
@@ -7958,11 +7960,13 @@
 		reg = rd32(E1000_DTXCTL);
 		reg |= E1000_DTXCTL_VLAN_ADDED;
 		wr32(E1000_DTXCTL, reg);
+		/* Fall through */
 	case e1000_82580:
 		/* enable replication vlan tag stripping */
 		reg = rd32(E1000_RPLOLR);
 		reg |= E1000_RPLOLR_STRVLAN;
 		wr32(E1000_RPLOLR, reg);
+		/* Fall through */
 	case e1000_i350:
 		/* none of the above registers are supported by i350 */
 		break;