clk: sunxi: Use proper type for of_clk_get_parent_count() return value

The return type of of_clk_get_parent_count() is an unsigned int
now, so let's update the code here to be more explicit about the
range of values we can test for.

Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

drivers/clk/sunxi/clk-sun6i-ar100.c

@@ -181,7 +181,7 @@ static int sun6i_a31_ar100_clk_probe(struct platform_device *pdev)
 	struct ar100_clk *ar100;
 	struct resource *r;
 	struct clk *clk;
-	int nparents;
+	unsigned int nparents;
 
 	ar100 = devm_kzalloc(&pdev->dev, sizeof(*ar100), GFP_KERNEL);
 	if (!ar100)