fix imu_data memory leak

src/recorder.cpp

@@ -176,7 +176,7 @@ void JasonRecorder::get_samples(std::vector<std::uint8_t> &samples, std::vector<
             else if ((((std::uint16_t) buffer[1] << 8 )|(buffer[2])) == DATA_ID) {
                 // find the beginning and length of the samples in the buffer
                 size_t start = this->additional_data_size + 6;
-
+                imu_data.resize(0);
                 imu_data.reserve(this->additional_data_size);
                 imu_data.insert(imu_data.begin(), &buffer[6], &buffer[start]);
                 size_t num_samples = (received - start);