cleanup error handling.

cleanup error handling.

336 cleanup_mem:
337        /* cleanup memory */
338
339        /* free tmpPath memory */

	CID 1452701 (#1 of 1): Dereference before null check (REVERSE_INULL)
	check_after_deref: Null-checking tmpPath suggests that it
	may be null, but it has already been dereferenced on all
	paths leading to the check.

340        if (tmpPath != NULL && result != ISC_R_SUCCESS)
341                isc_mem_free(named_g_mctx, tmpPath);
342
343        /* free tmpPath memory */
344        return (result);