i2c: mux-gpmux: Add of_node_put() when breaking out of loop

i2c: mux-gpmux: Add of_node_put() when breaking out of loop

[ Upstream commit 5d2ccb853ecb774fb9fbb18646b0b9095045ea0a ]

In i2c_mux_probe(), we should call of_node_put() when breaking out
of for_each_child_of_node() which will automatically increase and
decrease the refcount.

Fixes: 084a8653c40a ("i2c: i2c-mux-gpmux: new driver")
Signed-off-by: Liang He <windhl@126.com>
Acked-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>