irqchip: crossbar: Remove IS_ERR_VALUE check

IS_ERR_VALUE makes sense only *if* there could be valid values in
negative error range. But in the cases that we do use it, there is no
such case. Just remove the same.

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Sricharan R <r.sricharan@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Link: https://lkml.kernel.org/r/1403766634-18543-7-git-send-email-r.sricharan@ti.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

drivers/irqchip/irq-crossbar.c

@@ -102,15 +102,15 @@ static int crossbar_domain_xlate(struct irq_domain *d,
 				 unsigned long *out_hwirq,
 				 unsigned int *out_type)
 {
-	unsigned long ret;
+	int ret;
 
 	ret = get_prev_map_irq(intspec[1]);
-	if (!IS_ERR_VALUE(ret))
+	if (ret >= 0)
 		goto found;
 
 	ret = allocate_free_irq(intspec[1]);
 
-	if (IS_ERR_VALUE(ret))
+	if (ret < 0)
 		return ret;
 
 found: