SafeUsbRequest class added hoping to fix #40 bug

usbserial/src/main/java/com/felhr/utils/SafeUsbRequest.java

@@ -0,0 +1,34 @@
+package com.felhr.utils;
+
+import android.hardware.usb.UsbRequest;
+
+import java.lang.reflect.Field;
+import java.nio.ByteBuffer;
+
+
+public class SafeUsbRequest extends UsbRequest
+{
+    static final String usbRqBufferField = "mBuffer";
+    static final String usbRqLengthField = "mLength";
+
+    @Override
+    public boolean queue(ByteBuffer buffer, int length)
+    {
+        Field usbRequestBuffer;
+        Field usbRequestLength;
+        try
+        {
+            usbRequestBuffer = UsbRequest.class.getDeclaredField(usbRqBufferField);
+            usbRequestLength = UsbRequest.class.getDeclaredField(usbRqLengthField);
+            usbRequestBuffer.setAccessible(true);
+            usbRequestLength.setAccessible(true);
+            usbRequestBuffer.set(this, buffer);
+            usbRequestLength.set(this, length);
+        } catch (Exception e)
+        {
+            throw new RuntimeException(e);
+        }
+
+        return super.queue(buffer, length);
+    }
+}