hostapd: fix logging of configuration content

hostapd: fix logging of configuration content

As discussed in openwrt#17517, there are contents of hostapd's configuration file logged in syslog.
This includes critical information like `passphrase`. To circumvent this condition,
this commit logs only "inline" if config_fname is inline data.

Otherwise the upstream logic of hostapd applies.

Fixes: openwrt#14049
Signed-off-by: Christian Korber <ck@dev.tdt.de>
Link: https://github.com/openwrt/openwrt/pull/17718
Signed-off-by: Robert Marko <robimarko@gmail.com>