updsted the USB to persuade it to build for the Dragonfly platfom

Fork of USBDevice by mbed official

Revision:
14:d495202c90f4
Parent:
1:80ab0d068708
Child:
51:deafa44182d9
diff -r 16731886c049 -r d495202c90f4 USBSerial/CircBuffer.h
--- a/USBSerial/CircBuffer.h	Tue Sep 10 15:14:55 2013 +0300
+++ b/USBSerial/CircBuffer.h	Thu Sep 12 14:45:27 2013 +0100
@@ -29,6 +29,10 @@
         buf = (T *)malloc(size * sizeof(T));
     };
 
+    ~CircBuffer() {
+        free(buf);
+     }
+
     bool isFull() {
         return ((write + 1) % size == read);
     };