[iioadaptor] Flag unused parameter. MER#1749

There are compilation time warnings about unused parameter in the
IioAdaptor::scanElementsEnable() method.

Assume that the device parameter is ignored on purpose and flag it
with Q_UNUSED() to hide the warning.

Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

adaptors/iioadaptor/iioadaptor.cpp

@@ -327,6 +327,8 @@ int IioAdaptor::sysfsReadInt(QString filename)
 // Return the number of channels
 int IioAdaptor::scanElementsEnable(int device, int enable)
 {
+    Q_UNUSED(device);
+
     QString elementsPath = iioDevice.devicePath + "scan_elements";
 
     QDir dir(elementsPath);