i40e: fix: remove needless retries of NVM update

Remove wrong EIO to EGAIN conversion and pass all errors as is.

After commit 230f3d5 ("i40e: remove i40e_status"), which should only
replace F/W specific error codes with Linux kernel generic, all EIO errors
suddenly started to be converted into EAGAIN which leads nvmupdate to retry
until it timeouts and sometimes fails after more than 20 minutes in the
middle of NVM update, so NVM becomes corrupted.

The bug affects users only at the time when they try to update NVM, and
only F/W versions that generate errors while nvmupdate. For example, X710DA2
with 0x8000ECB7 F/W is affected, but there are probably more...

Command for reproduction is just NVM update:
 ./nvmupdate64

In the log instead of:
 i40e_nvmupd_exec_aq err I40E_ERR_ADMIN_QUEUE_ERROR aq_err I40E_AQ_RC_ENOMEM)
appears:
 i40e_nvmupd_exec_aq err -EIO aq_err I40E_AQ_RC_ENOMEM
 i40e: eeprom check failed (-5), Tx/Rx traffic disabled

The problematic code did silently convert EIO into EAGAIN which forced
nvmupdate to ignore EAGAIN error and retry the same operation until timeout.
That's why NVM update takes 20+ minutes to finish with the fail in the end.

Fixes: 230f3d5 ("i40e: remove i40e_status")
Co-developed-by: Kelvin Kang <[email protected]>
Signed-off-by: Kelvin Kang <[email protected]>
Reviewed-by: Arkadiusz Kubalewski <[email protected]>
Signed-off-by: Aleksandr Loktionov <[email protected]>
Reviewed-by: Przemek Kitszel <[email protected]>
Tested-by: Tony Brelinski <[email protected]>
Signed-off-by: Tony Nguyen <[email protected]>
Reviewed-by: Jacob Keller <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: aloktion

drivers/net/ethernet/intel/i40e/i40e_adminq.h

@@ -109,10 +109,6 @@ static inline int i40e_aq_rc_to_posix(int aq_ret, int aq_rc)
 		-EFBIG,      /* I40E_AQ_RC_EFBIG */
 	};
 
-	/* aq_rc is invalid if AQ timed out */
-	if (aq_ret == -EIO)
-		return -EAGAIN;
-
 	if (!((u32)aq_rc < (sizeof(aq_to_posix) / sizeof((aq_to_posix)[0]))))
 		return -ERANGE;