igb: minor ethool regdump amendment

This patch has no functional impact and it is just a preparation
for the following patch. It removes an early return from the
'igb_get_regs()' function by moving the 82576-only registers
dump into an "if" block. With this preparation, we can dump more
non-82576 registers at the end of this function.
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

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

@@ -675,8 +675,7 @@ static void igb_get_regs(struct net_device *netdev,
 		regs_buff[554] = adapter->stats.b2ogprc;
 	}
 
-	if (hw->mac.type != e1000_82576)
-		return;
+	if (hw->mac.type == e1000_82576) {
 		for (i = 0; i < 12; i++)
 			regs_buff[555 + i] = rd32(E1000_SRRCTL(i + 4));
 		for (i = 0; i < 4; i++)
@@ -710,6 +709,7 @@ static void igb_get_regs(struct net_device *netdev,
 			regs_buff[715 + i] = rd32(E1000_TDWBAL(i + 4));
 		for (i = 0; i < 12; i++)
 			regs_buff[727 + i] = rd32(E1000_TDWBAH(i + 4));
+	}
 }
 
 static int igb_get_eeprom_len(struct net_device *netdev)