HID: hid-logitech-hidpp: add NULL check on devm_kmemdup() return value

Check return value from call to devm_kmemdup() in order to prevent a NULL
pointer dereference.
Signed-off-by: NGustavo A. R. Silva <garsilva@embeddedor.com>
Reviewed-by: NBenjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

drivers/hid/hid-logitech-hidpp.c

@@ -2732,6 +2732,9 @@ static int hidpp_initialize_battery(struct hidpp_device *hidpp)
 				     hidpp_battery_props,
 				     sizeof(hidpp_battery_props),
 				     GFP_KERNEL);
+	if (!battery_props)
+		return -ENOMEM;
+
 	num_battery_props = ARRAY_SIZE(hidpp_battery_props) - 2;
 
 	if (hidpp->capabilities & HIDPP_CAPABILITY_BATTERY_MILEAGE)