soc/tegra: fuse: Add missing of_node_put() in tegra_init_fuse()

In this function, of_find_matching_node() will return a node pointer
with refcount incremented. We should use of_node_put() when the "np"
pointer is not used anymore.

Signed-off-by: Liang He <windhl@126.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>