Uninitialized variable causing test failure

[jcaplan]

netmap/utils/fd_server.c

Lines 123 to 125 in b58a473

	if (marshal(res, entry) < 0)
	return -1;
	return entry->nmd->fd;

Similar to the end of the function since we’re returning a successful result here then res->result=0 should be set. Or res should be initialized to 0 in handle_request. Otherwise if there happens to be non-zero data there then the test fails for no reason because functional gets a non-zero return code.