'dispatch' must be non NULL, remove test.

'dispatch' must be non NULL, remove test.

10067 cleanup:

	CID 1452683 (#1 of 1): Dereference before null check (REVERSE_INULL)
	check_after_deref: Null-checking dispatch suggests that it
	may be null, but it has already been dereferenced on all
	paths leading to the check.

10068        if (dispatch != NULL)
10069                isc_mem_put(server->mctx, dispatch, sizeof(*dispatch));