igb: Fix hw_dbg logging in igb_update_flash_i210

Fix an if statement with hw_dbg lines where the logic was inverted with
regards to the corresponding return value used in the if statement.

Signed-off-by: Hannu Lounento <hannu.lounento@ge.com>
Signed-off-by: Peter Senna Tschudin <peter.senna@collabora.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>