nvmem: add missing of_node_put() in of_nvmem_cell_get()

of_get_next_parent() increments the refcount of the returned node.
It should be put when done.

Signed-off-by: Masahiro Yamada <[e-mail]>
Signed-off-by: Srinivas Kandagatla <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/nvmem/core.c

···
 		return ERR_PTR(-EINVAL);
 
 	nvmem = __nvmem_device_get(nvmem_np, NULL, NULL);
+	of_node_put(nvmem_np);
 	if (IS_ERR(nvmem))
 		return ERR_CAST(nvmem);