irq: Fix typo in header comment

Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/include/irq.h b/include/irq.h
index 1d08cb8..5638c10 100644
--- a/include/irq.h
+++ b/include/irq.h
@@ -109,7 +109,7 @@
 	 * xxx_xlate() call, or as the only step in implementing a client's
 	 * irq_request() call.
 	 *
-	 * @irq:	The irq struct to request; this has been fille in by
+	 * @irq:	The irq struct to request; this has been filled in by
 	 *		a previoux xxx_xlate() function call, or by the caller
 	 *		of irq_request().
 	 * @return 0 if OK, or a negative error code.