irqchip/ti-sci-inta: Fix unsigned comparison to zero

ti_sci_inta_xlate_irq() return -ENOENT on fail, p_hwirq
should be int type.

Fixes: 5c4b585 ("irqchip/ti-sci-inta: Add support for INTA directly connecting to GIC")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Lokesh Vutla <lokeshvutla@ti.com>
Link: https://lore.kernel.org/r/20200826035430.21060-1-yuehaibing@huawei.com

Author: YueHaibing

drivers/irqchip/irq-ti-sci-inta.c

@@ -175,8 +175,8 @@ static struct ti_sci_inta_vint_desc *ti_sci_inta_alloc_parent_irq(struct irq_dom
 	struct irq_fwspec parent_fwspec;
 	struct device_node *parent_node;
 	unsigned int parent_virq;
-	u16 vint_id, p_hwirq;
-	int ret;
+	int p_hwirq, ret;
+	u16 vint_id;
 
 	vint_id = ti_sci_get_free_resource(inta->vint);
 	if (vint_id == TI_SCI_RESOURCE_NULL)