irq_domain: correct a minor wrong comment for linear revmap

The revmap type should be linear for irq_domain_add_linear function.

Signed-off-by: Dong Aisheng <dong.aisheng@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 0c51958..622fdf4 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -248,7 +248,7 @@
 EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
 
 /**
- * irq_domain_add_linear() - Allocate and register a legacy revmap irq_domain.
+ * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
  * @of_node: pointer to interrupt controller's device tree node.
  * @size: Number of interrupts in the domain.
  * @ops: map/unmap domain callbacks