maybe a flaw , in src/expand_path.c

[敖 伟成]

here "return NULL", i think it will cause weakly memory leaks.
code snippet follows:
(in function: expand_path)
################################
#ifdef GETPWNAM_MISSING
    if (line != 0)
 error (0, 0,
        "%s:%d:tilde expansion not supported on this system",
        file, line);
    else
 error (0, 0, "%s:tilde expansion not supported on this system",
        file);
    return NULL;
#else
    struct passwd *ps;
    ps = getpwnam (buf + d);
    if (ps == 0)
    {
 if (line != 0)
     error (0, 0, "%s:%d: no such user %s",
     file, line, buf + d);
 else
     error (0, 0, "%s: no such user %s", file, buf + d);
 return NULL;
    }
    e = ps->pw_dir;
#endif

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