clk: at91: make use of of_clk_parent_fill helper function

Use of_clk_parent_fill to fill in the parent clock names' array.

Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
diff --git a/drivers/clk/at91/clk-slow.c b/drivers/clk/at91/clk-slow.c
index 98a84a8..84c19d7 100644
--- a/drivers/clk/at91/clk-slow.c
+++ b/drivers/clk/at91/clk-slow.c
@@ -371,17 +371,12 @@
 	const char *parent_names[2];
 	int num_parents;
 	const char *name = np->name;
-	int i;
 
 	num_parents = of_clk_get_parent_count(np);
 	if (num_parents <= 0 || num_parents > 2)
 		return;
 
-	for (i = 0; i < num_parents; ++i) {
-		parent_names[i] = of_clk_get_parent_name(np, i);
-		if (!parent_names[i])
-			return;
-	}
+	of_clk_parent_fill(np, parent_names, num_parents);
 
 	of_property_read_string(np, "clock-output-names", &name);
 
@@ -449,17 +444,12 @@
 	const char *parent_names[2];
 	int num_parents;
 	const char *name = np->name;
-	int i;
 
 	num_parents = of_clk_get_parent_count(np);
 	if (num_parents != 2)
 		return;
 
-	for (i = 0; i < num_parents; ++i) {
-		parent_names[i] = of_clk_get_parent_name(np, i);
-		if (!parent_names[i])
-			return;
-	}
+	of_clk_parent_fill(np, parent_names, num_parents);
 
 	of_property_read_string(np, "clock-output-names", &name);