In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/rc.button/rfkill line 3:

[ "${ACTION}" = "released" -o -n "${TYPE}" ] || exit 0

                           ^-- SC2166 (warning): Prefer [ p ] || [ q ] as [ p -o q ] is not well defined.

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/rc.button/rfkill line 5:

. /lib/functions.sh

  ^---------------^ SC1091 (info): Not following: /lib/functions.sh was not specified as input (see shellcheck -x).

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/rc.button/rfkill line 10:

	uci set wireless.$1.disabled=$rfkill_state

                         ^-- SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 

	uci set wireless."$1".disabled=$rfkill_state

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/rc.button/rfkill line 14:

	local disabled

        ^------------^ SC3043 (warning): In POSIX sh, 'local' is undefined.

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/rc.button/rfkill line 15:

	config_get disabled $1 disabled

                            ^-- SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 

	config_get disabled "$1" disabled

For more information:

  https://www.shellcheck.net/wiki/SC2166 -- Prefer [ p ] || [ q ] as [ p -o q...

  https://www.shellcheck.net/wiki/SC3043 -- In POSIX sh, 'local' is undefined.

  https://www.shellcheck.net/wiki/SC1091 -- Not following: /lib/functions.sh ...