Fixes #24

Author: ygoe

UsbSerialForAndroid/driver/FtdiSerialDriver.cs

@@ -212,7 +212,7 @@ protected int ReadFilter(byte[] buffer, int totalBytesRead, int maxPacketSize)
                     if (length < 0)
                         throw new IOException("Expected at least " + READ_HEADER_LENGTH + " bytes");
 
-                    Buffer.BlockCopy(buffer, srcPos + READ_HEADER_LENGTH, buffer, destPos, length);
+                    Buffer.BlockCopy(mReadBuffer, srcPos + READ_HEADER_LENGTH, buffer, destPos, length);
                     destPos += length;
                 }
                 return destPos;
@@ -497,4 +497,4 @@ public static Dictionary<int, int[]> GetSupportedDevices()
             };
         }
     }
-}
+}