igb: fix nvm.ops.read() error handling

Add error handling into igb_set_eeprom() function, in case
nvm.ops.read() fails just quit with error code asap.

Fixes: 9d5c8243 ("igb: PCI-Express 82575 Gigabit Ethernet driver")
Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>