[IA64] Fix wrong return value in parse_vector_domain

Fix wrong return value in parse_vector_domain().
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/irq_ia64.c

@@ -289,7 +289,7 @@ static int __init parse_vector_domain(char *arg)
 		vector_domain_type = VECTOR_DOMAIN_PERCPU;
 		no_int_routing = 1;
 	}
-	return 1;
+	return 0;
 }
 early_param("vector", parse_vector_domain);
 #else