In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/openssh/sshd_check_keys line 4:

    local FILE=$1

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

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

Did you mean: 

    local FILE="$1"

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/openssh/sshd_check_keys line 5:

    local TYPE=$2

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

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

Did you mean: 

    local TYPE="$2"

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/openssh/sshd_check_keys line 6:

    local DIR="$(dirname "$FILE")"

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

          ^-^ SC2155 (warning): Declare and assign separately to avoid masking return values.

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/openssh/sshd_check_keys line 9:

    ssh-keygen -q -f "${FILE}.tmp" -N '' -t $TYPE

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

Did you mean: 

    ssh-keygen -q -f "${FILE}.tmp" -N '' -t "$TYPE"

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/openssh/sshd_check_keys line 35:

    . /etc/default/ssh

      ^--------------^ SC1091 (info): Not following: /etc/default/ssh was not specified as input (see shellcheck -x).

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/openssh/sshd_check_keys line 39:

kdir -p $SYSCONFDIR

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

Did you mean: 

mkdir -p "$SYSCONFDIR"

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/openssh/sshd_check_keys line 42:

set -- ${SSHD_OPTS} --

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

Did you mean: 

set -- "${SSHD_OPTS}" --

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/openssh/sshd_check_keys line 63:

    [ -f $key ] && continue

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

Did you mean: 

    [ -f "$key" ] && continue

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/openssh/sshd_check_keys line 67:

        generate_key $key rsa

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

Did you mean: 

        generate_key "$key" rsa

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/openssh/sshd_check_keys line 71:

        generate_key $key ecdsa

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

Did you mean: 

        generate_key "$key" ecdsa

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/openssh/sshd_check_keys line 75:

        generate_key $key ed25519

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

Did you mean: 

        generate_key "$key" ed25519

For more information:

  https://www.shellcheck.net/wiki/SC2155 -- Declare and assign separately to ...

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

  https://www.shellcheck.net/wiki/SC1091 -- Not following: /etc/default/ssh w...