igb/ixgbe: remove return statements for void functions

Remove useless return statements for void functions which do not need
it.

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>

drivers/net/ethernet/intel/igb/e1000_nvm.c

@@ -798,5 +798,4 @@ etrack_id:
 		fw_vers->etrack_id = (eeprom_verh << NVM_ETRACK_SHIFT)
 			| eeprom_verl;
 	}
-	return;
 }

drivers/net/ethernet/intel/ixgbe/ixgbe_82598.c

@@ -1278,8 +1278,6 @@ static void ixgbe_set_rxpba_82598(struct ixgbe_hw *hw, int num_pb,
 	/* Setup Tx packet buffer sizes */
 	for (i = 0; i < IXGBE_MAX_PACKET_BUFFERS; i++)
 		IXGBE_WRITE_REG(hw, IXGBE_TXPBSIZE(i), IXGBE_TXPBSIZE_40KB);
-
-	return;
 }
 
 static struct ixgbe_mac_operations mac_ops_82598 = {

drivers/net/ethernet/intel/ixgbe/ixgbe_dcb.c

@@ -389,7 +389,6 @@ static void ixgbe_dcb_read_rtrup2tc_82599(struct ixgbe_hw *hw, u8 *map)
 	for (i = 0; i < MAX_USER_PRIORITY; i++)
 		map[i] = IXGBE_RTRUP2TC_UP_MASK &
 			(reg >> (i * IXGBE_RTRUP2TC_UP_SHIFT));
-	return;
 }
 
 void ixgbe_dcb_read_rtrup2tc(struct ixgbe_hw *hw, u8 *map)