rtw89: fix return value in hfc_pub_cfg_chk

It seems to me when pub_cfg->grp0 + pub_cfg->grp1 != pub_cfg->pub_max is true,
it should return -EFAULT rather than 0.  Otherwise, the function doesn't need
to exist.

Signed-off-by: Kevin Lo <kevlo@kevlo.org>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/YXEJey8lKksAZif4@ns.kevlo.org