BACKPORT: nvmem: core: Fix a resource leak on error in nvmem_add_cells_from_of()

This doesn't call of_node_put() on the error path so it leads to a
memory leak.

Bug: 254441685
Fixes: 0749aa25af82 ("nvmem: core: fix regression in of_nvmem_cell_get()")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210129171430.11328-2-srinivas.kandagatla@linaro.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 72e008ce307fa2f35f6783997378b32e83122839)
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: I1a34db56d82297e28bcb1baee37a78f9126063e4