HID: logitech-dj: add debug msg when exporting a HID++ report descriptors

When exporting all other types of report descriptors we print a debug
message. Not doing so for HID++ descriptors makes unaware users think
that no HID++ descriptor was exported.
Signed-off-by: Filipe Laíns <lains@archlinux.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-logitech-dj.c

@@ -1368,6 +1368,8 @@ static int logi_dj_ll_parse(struct hid_device *hid)
 	}
 
 	if (djdev->reports_supported & HIDPP) {
+		dbg_hid("%s: sending a HID++ descriptor, reports_supported: %llx\n",
+			__func__, djdev->reports_supported);
 		rdcat(rdesc, &rsize, hidpp_descriptor,
 		      sizeof(hidpp_descriptor));
 	}