important bugfix for i2c device com IF

src/fsfw_hal/linux/i2c/I2cComIF.cpp

@@ -216,7 +216,7 @@ ReturnValue_t I2cComIF::readReceivedMessage(CookieIF* cookie, uint8_t** buffer,
   }
   *buffer = i2cDeviceMapIter->second.replyBuffer.data();
   *size = i2cDeviceMapIter->second.replyLen;
-
+  i2cDeviceMapIter->second.replyLen = 0;
   return returnvalue::OK;
 }