rbutil warning

rbutilwarn1

diff --git a/rbutil/rbutilqt/base/system.cpp b/rbutil/rbutilqt/base/system.cpp
index 02e6ac9..5894389 100644
--- a/rbutil/rbutilqt/base/system.cpp
+++ b/rbutil/rbutilqt/base/system.cpp
@@ -246,11 +246,10 @@ QMap<uint32_t, QString> System::listUsbDevices(void)
 #if defined(Q_OS_LINUX)
 #if defined(LIBUSB1)
     libusb_device **devs;
-    int res;
-    ssize_t count;
-    res = libusb_init(NULL);
+    
+    libusb_init(NULL);
 
-    count = libusb_get_device_list(NULL, &devs);
+    libusb_get_device_list(NULL, &devs);
     libusb_device *dev;
     int i = 0;
     while((dev = devs[i++]) != NULL) {