Fix potential memory leaks

#include <stdio.h>

#include <stdlib.h>

#include <fcntl.h>

#include <memory>

#include <string.h>

#include <sys/mman.h>

#include <sys/stat.h>

    // mono takes left channel only (out of stereo output pair)

    // stereo and multichannel preserve all channels.

    int32_t* out = (int32_t*) output_vaddr;

    int16_t* convert = (int16_t*) malloc(output_frames * channels * sizeof(int16_t));

    std::unique_ptr<int16_t[]> convert(new int16_t[output_frames * channels]);

    const int volumeShift = 12; // shift requirement for Q4.27 to Q.15

    // round to half towards zero and saturate at int16 (non-dithered)

        perror(file_out);

        return EXIT_FAILURE;

    }

    (void) sf_writef_short(sf, convert, output_frames);

    (void) sf_writef_short(sf, convert.get(), output_frames);

    sf_close(sf);

    return EXIT_SUCCESS;