In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/init.d/firewall line 3:

START=19

^---^ SC2034 (warning): START appears unused. Verify use (or export if used externally).

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/init.d/firewall line 4:

USE_PROCD=1

^-------^ SC2034 (warning): USE_PROCD appears unused. Verify use (or export if used externally).

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/init.d/firewall line 7:

validate_firewall_redirect()

^-- SC2120 (warning): validate_firewall_redirect references arguments, but none are ever passed.

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/init.d/firewall line 20:

validate_firewall_rule()

^-- SC2120 (warning): validate_firewall_rule references arguments, but none are ever passed.

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/init.d/firewall line 35:

	validate_firewall_redirect

        ^------------------------^ SC2119 (info): Use validate_firewall_redirect "$@" if function's $1 should mean script's $1.

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/init.d/firewall line 36:

	validate_firewall_rule

        ^--------------------^ SC2119 (info): Use validate_firewall_rule "$@" if function's $1 should mean script's $1.

In /logs/firmware/unblob_extracted/firmware_extract/1568982-13971496.squashfs_v4_le_extract/etc/init.d/firewall line 45:

	fw3 ${QUIET} start

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

Did you mean: 

	fw3 "${QUIET}" start

For more information:

  https://www.shellcheck.net/wiki/SC2034 -- START appears unused. Verify use ...

  https://www.shellcheck.net/wiki/SC2120 -- validate_firewall_redirect refere...

  https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...