device handle check fixed (check for 0 and not <0 as this may be a valid address)

git-svn-id: https://svn.code.sf.net/p/libusbjava/code/trunk@255 94ad28fe-ef68-46b1-9651-e7ae4fcf1c4c

java/src/ch/ntb/usb/Device.java

@@ -182,7 +182,7 @@ public class Device {
 
 		if (dev != null) {
 			int res = LibusbJava.usb_open(dev);
-			if (res <= 0) {
+			if (res != 0) {
 				throw new USBException("LibusbJava.usb_open: "
 						+ LibusbJava.usb_strerror());
 			}