mwlwifi: FIX UpdateEncryption timeout issue

[Johannes Krottmayer]

Hi,

I have released a pull request for the Marvell/NXP driver, for the 
purpose of testing.
It fixes the UpdateEncyption timeout issue on my router (WRT32X - 
88MW8964) running 21.02.0.

Formerly have created this modification to get the right result code 
from the IC, to know
whats going on. A side effect is, it also solves the WiFi issues on my 
router.

The small pull request should be self explaining. I removed the command 
check in the do while
iteration. Don't know why this was used here. Instead I check the result 
code in the command
header for HOSTCMD_RESULT_OK. If the timeout is elapsed, another (error) 
code should be printed.

If you need some additional information, please don't hesitate to ask it.

Pull-request:
https://github.com/kaloz/mwlwifi/pull/401

The modification is also discussed in the OpenWrt forum.