In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/lib/conf-migrate/upgrade-run.d/openssh_permitrootlogin.sh line 3:

. /lib/rcscripts/sh/files.sh

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

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/lib/conf-migrate/upgrade-run.d/openssh_permitrootlogin.sh line 11:

! grep -iq "^[[:blank:]]*$kw_pr[[:blank:]]" $sshd_config || kw_pr=

                         ^-- SC1087 (error): Use braces when expanding arrays, e.g. ${array[idx]} (or ${var}[.. to quiet).

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/lib/conf-migrate/upgrade-run.d/openssh_permitrootlogin.sh line 12:

! grep -iq "^[[:blank:]]*$kw_au[[:blank:]]" $sshd_config || kw_au=

                         ^-- SC1087 (error): Use braces when expanding arrays, e.g. ${array[idx]} (or ${var}[.. to quiet).

For more information:

  https://www.shellcheck.net/wiki/SC1087 -- Use braces when expanding arrays,...

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