wifi: mwifiex: let mwifiex_init_fw() return 0 for success

wifi: mwifiex: let mwifiex_init_fw() return 0 for success

mwifiex_sta_init_cmd() returns -EINPROGRESS as success indication when
the init param is true. Likewise mwifiex_init_fw() returns -EINPROGRESS
as success indication: It will either return -EINPROGRESS directly when
in mfg_mode or the return value of mwifiex_sta_init_cmd() when in normal
mode.

-EINPROGRESS is a leftover from times when the initialization commands
were sent asynchronously. Since Commit 7bff9c974e1a ("mwifiex: send
firmware initialization commands synchronously") the return value has
become meaningless, so change mwifiex_sta_init_cmd() and
mwifiex_init_fw() to return 0 for success.

Reviewed-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Acked-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Link: https://patch.msgid.link/20250423-mwifiex-drop-asynchronous-init-v2-2-1bb951073a06@pengutronix.de
Signed-off-by: Johannes Berg <johannes.berg@intel.com>