busybox/init: amend comment on block devices

packages/sysutils/busybox/scripts/init

@@ -854,7 +854,7 @@ check_update() {
   FLASH_FREE=$(df /flash/ | awk '/[0-9]%/{print $4}')
   FLASH_FREE=$(( $FLASH_FREE * 1024 ))
 
-  # Disregard kernel size if it's a a block device, which is the case on Amlogic/WeTek devices
+  # Disregard kernel size if it's a a block device
   if [ ! -b "/$IMAGE_KERNEL" ]; then
     OLD_KERNEL=$(stat -t "/flash/$IMAGE_KERNEL" | awk '{print $2}')
   else