powerpc/512x: Add missing of_node_put() in mpc5121_clk_init()

In mpc5121_clk_init(), of_find_compatible_node() will return a
node pointer with refcount incremented. The reference should be dropped
with of_node_put() when it is not used anymore.
Signed-off-by: Liang He <windhl@126.com>
[mpe: of_clk_add_provider() will take its own reference.]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220615143703.3968898-1-windhl@126.com

arch/powerpc/platforms/512x/clock-commonclk.c

@@ -1208,6 +1208,8 @@ int __init mpc5121_clk_init(void)
 	/* register as an OF clock provider */
 	mpc5121_clk_register_of_provider(clk_np);
 
+	of_node_put(clk_np);
+
 	/*
 	 * unbreak not yet adjusted peripheral drivers during migration
 	 * towards fully operational common clock support, and allow