memory leak in dmtp.c on realloc failure

[Eduard Wirch]

Line 1508:

if (!(result = realloc(result, rsize))) {
    PUSH_ERROR_SYSCALL("realloc");
    free(line);
    RET_ERROR_PTR(ERR_NOMEM, "could not read multiline DMTP response because of memory allocation problem");
}

Block previously pointed by result is not freed on realloc failure.

[Ivan]

fixed.