meta-fii: meta-kudo: Fix shellcheck errors

Fixes bash shellcheck errors so that the exemptions in run-repotest
can be removed.

Signed-off-by: Charles Boyer <Charles.Boyer@fii-usa.com>
Change-Id: I6afb059cf1151c871ddfcaf67efc6a63183f7130
diff --git a/meta-fii/meta-kudo/recipes-phosphor/fans/pwm-init/bin/pwm_init.sh b/meta-fii/meta-kudo/recipes-phosphor/fans/pwm-init/bin/pwm_init.sh
index bd88e01..5394cb6 100644
--- a/meta-fii/meta-kudo/recipes-phosphor/fans/pwm-init/bin/pwm_init.sh
+++ b/meta-fii/meta-kudo/recipes-phosphor/fans/pwm-init/bin/pwm_init.sh
@@ -3,7 +3,7 @@
 # Set all fans to pwm mode.
 
 # Set all pwm_enable to 1
-find /sys/class/hwmon/hwmon*/ -name 'pwm*_enable' -exec bash -c 'echo "${1}" && echo 1 > "${1}" && cat "${1}"' -- {} \;
+find /sys/class/hwmon/hwmon*/ -name 'pwm*_enable' -exec bash -c 'echo "$1" && echo 1 > "$1" && cat "$1"' -- {} \;
 
 for i in {0..5}
 do