clk: fix an OF node reference leak in of_clk_get_parent_name()

Current implementation of of_clk_get_parent_name() leaks an OF node
reference on error path. Add a of_node_put() call before returning an
error.

This bug was found by an experimental static analysis tool that I am
developing.

Fixes: 8da411c ("clk: let of_clk_get_parent_name() fail for invalid clock-indices")
Signed-off-by: Joe Hattori <joe@pf.is.s.u-tokyo.ac.jp>
Link: https://lore.kernel.org/r/20241210130913.3615205-1-joe@pf.is.s.u-tokyo.ac.jp
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: joehattori

drivers/clk/clk.c

@@ -5385,8 +5385,10 @@ const char *of_clk_get_parent_name(const struct device_node *np, int index)
 		count++;
 	}
 	/* We went off the end of 'clock-indices' without finding it */
-	if (of_property_present(clkspec.np, "clock-indices") && !found)
+	if (of_property_present(clkspec.np, "clock-indices") && !found) {
+		of_node_put(clkspec.np);
 		return NULL;
+	}
 
 	if (of_property_read_string_index(clkspec.np, "clock-output-names",
 					  index,