Fix: switch section search

[obsy]

Some devices do not have "switch" section, but have "gpioswitch" section, ex Mikrotik 912:

{
    "model": {
        "id": "rb-912uag-2hpnd",
        "name": "Mikrotik RouterBOARD 912UAG-2HPnD"
    },
    "network": {
        "lan": {
            "ifname": "eth0",
            "protocol": "static"
        }
    },
    "gpioswitch": {
        "usb_power_switch": {
            "name": "USB Power Switch",
            "pin": 61,
            "default": 1
        }
    }
}

This causes incorrect switch detection and errors like:

WARNING: Variable 'switch' does not exist or is not an array/object
WARNING: Variable 'ports' does not exist or is not an array/object
WARNING: Variable 'id' does not exist or is not an array/object
WARNING: Variable 'name' does not exist or is not an array/object

Fix this by explicitly searching for the "switch" section.

[lantis1008]

@obsy this looks like a bad fix. We don't grep the entire file, we just grep the output of json_get_keys BOARDKEYS, which does not contain ":" character or the literal quotation marks. A better fix might be:

 json_load_file "/etc/board.json"
 json_get_keys BOARDKEYS
-SWITCHTEST=$(echo $BOARDKEYS | grep "switch")
+for KEY in $BOARDKEYS; do
+    [ "$KEY" = "switch" ] && SWITCHTEST="1"
+done
 [ -n "$SWITCHTEST" ] || exit 0

 json_select switch

Do you agree?

[obsy]

Looks good.

[lantis1008]

Thanks, i've pushed the fix