of: Grammar s/an/a/

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 3ab72f57..8452e50 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -933,7 +933,7 @@
 }
 
 /**
- * of_match_node - Tell if an device_node has a matching of_match structure
+ * of_match_node - Tell if a device_node has a matching of_match structure
  *	@matches:	array of of device match structures to search in
  *	@node:		the of device structure to match against
  *