clk: fixup default index for of_clk_get_by_name()

of_clk_get_by_name() is using -1 for __of_clk_get() index.  It will go
to of_parse_clkspec(), and be used for of_parse_phandle_with_args().
Here, if user doesn't specify clock name (= of_clk_get_by_name(np,
NULL)), this index is still -1, and of_parse_phandle_with_args() will
return -EINVAL (This index will be updated if if it had clock name).
clk_get_by_name(np, NULL) should work, then, default index should be 0
instead of -1. This patch fixes it.

Fixes: 4472287a ("clk: Introduce of_clk_get_hw_from_clkspec()")
Signed-off-by: NKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: NStephen Boyd <sboyd@kernel.org>

drivers/clk/clk.c

@@ -4213,7 +4213,7 @@ struct clk *of_clk_get_by_name(struct device_node *np, const char *name)
 	if (!np)
 		return ERR_PTR(-ENOENT);
 
-	return __of_clk_get(np, -1, np->full_name, name);
+	return __of_clk_get(np, 0, np->full_name, name);
 }
 EXPORT_SYMBOL(of_clk_get_by_name);