clk: fixed-factor: Initialize clk_init_data on stack

This structure can be full of junk from the stack if we don't initialize
it. The clk framework tests clk_init_data::parent_names for non-NULL and
then considers that as the parent name pointer, but if it's full of junk
then we'll try to deref a bad pointer and oops the system. Let's
initialize the structure so that only clk_init_data::parent_names or
clk_init_data::parent_data is set, and not both.

Reported-by: "kernelci.org bot" <bot@kernelci.org>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Tony Lindgren <tony@atomide.com>
Fixes: ecbf3f1795 ("clk: fixed-factor: Let clk framework find parent")
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/clk-fixed-factor.c

@@ -70,7 +70,7 @@ __clk_hw_register_fixed_factor(struct device *dev, struct device_node *np,
 		unsigned long flags, unsigned int mult, unsigned int div)
 {
 	struct clk_fixed_factor *fix;
-	struct clk_init_data init;
+	struct clk_init_data init = { };
 	struct clk_parent_data pdata = { .index = index };
 	struct clk_hw *hw;
 	int ret;