Remove local keywords and uninitialized variables

Remove keywords such as "let", "typeset", and "local" that
are defined in BASH. Also, clean up any unused variables in
the process.

Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
Signed-off-by: Lisa Nguyen <lisa.nguyen@linaro.org>
diff --git a/thermal/thermal_04.sh b/thermal/thermal_04.sh
index 932903c..37c65f6 100755
--- a/thermal/thermal_04.sh
+++ b/thermal/thermal_04.sh
@@ -37,23 +37,23 @@
 }
 
 verify_cooling_device_temp_change() {
-    local dirpath=$THERMAL_PATH/$1
-    local cdev_name=$1
+    dirpath=$THERMAL_PATH/$1
+    cdev_name=$1
     shift 1
-    local tzonepath=$THERMAL_PATH/thermal_zone0
+    tzonepath=$THERMAL_PATH/thermal_zone0
     test -d $tzonepath
     if [ $? -ne 0 ] ; then
 	echo "No thermal zone present"
 	return 1;
     fi
-    local max_state=$(cat $dirpath/max_state)
-    local prev_state_val=$(cat $dirpath/cur_state)
+    max_state=$(cat $dirpath/max_state)
+    prev_state_val=$(cat $dirpath/cur_state)
 
-    local count=1
-    local cur_state_val=0
-    local init_temp=0
-    local final_temp=0
-    local cool_temp=0
+    count=1
+    cur_state_val=0
+    init_temp=0
+    final_temp=0
+    cool_temp=0
     ./$HEAT_CPU_MODERATE moderate &
     pid=$!
     test $pid -eq 0 && return