BACKPORT: nvmem: core: add a missing of_node_put

'for_each_child_of_node' performs an of_node_get on each iteration, so a
return from the middle of the loop requires an of_node_put.

Bug: 254441685
Fixes: e888d445ac33 ("nvmem: resolve cells from DT at registration time")
Cc: <stable@vger.kernel.org>
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210611102321.11509-1-srinivas.kandagatla@linaro.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 63879e2964bceee2aa5bbe8b99ea58bba28bb64f)
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: I30942d12d2d803ddb066a84b6401dcc7180954be