memory leak with mu_rfc2047_encode

Hello friends!

One of my programs is presenting large memory usage, and I traced it down
to the mu_rfc2047_encode function that I'm using.

If you compile and run the program below, it will use all of your memory.

--start--
#include <stdio.h>
#include "mailutils/mailutils.h"

void main() {

  char *value;

  while(1) {
    mu_rfc2047_encode("utf-8", "quoted-printable", "Any subject", &value);
    printf("Result: %s\n", value);
    if (value)
      free(value);
  }

}
--end--

I've tested this with the default "libmailutils-dev" (1:2.99.98-2) package
from Debian 8.7, but I've also tested with mailutils-3.1.1.

Perhaps I'm not using this function properly?

Thanks!

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