meta-facebook: fix shellcheck issues in scripts

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I62cf17d414795e91d673d468a196d4f0a6c0a71b
diff --git a/meta-facebook/recipes-fb/fb-powerctrl/files/setup_gpio.sh b/meta-facebook/recipes-fb/fb-powerctrl/files/setup_gpio.sh
index 2624abd..cac3b20 100755
--- a/meta-facebook/recipes-fb/fb-powerctrl/files/setup_gpio.sh
+++ b/meta-facebook/recipes-fb/fb-powerctrl/files/setup_gpio.sh
@@ -7,16 +7,16 @@
     return;
   fi
 
-  echo $1 > /sys/class/gpio/export
-  echo $2 > /sys/class/gpio/gpio$1/direction
+  echo "$1" > /sys/class/gpio/export
+  echo "$2" > "/sys/class/gpio/gpio$1/direction"
 }
 
 GPIO_BASE=$(cat /sys/class/gpio/gpio*/base)
 
 # FM_BMC_READY_N, GPIO S1, active low
-set_gpio_active_low $((${GPIO_BASE} + 144 +1)) low
+set_gpio_active_low $((GPIO_BASE + 144 +1)) low
 
 # FP_PECI_MUX, active low
-set_gpio_active_low $((${GPIO_BASE} + 212)) high
+set_gpio_active_low $((GPIO_BASE + 212)) high
 
 exit 0;