nvmem: core: fix missing of_node_put() in of_nvmem_device_get()

of_parse_phandle() returns device_node with incremented ref count
which needs to be decremented by of_node_put() when device_node
is not used.

Fixes: e2a5402e ("nvmem: Add nvmem_device based consumer apis.")
Signed-off-by: Vadym Kochan <vadym.kochan@plvision.eu>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200917134437.16637-5-srinivas.kandagatla@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/nvmem/core.c

@@ -835,6 +835,7 @@ struct nvmem_device *of_nvmem_device_get(struct device_node *np, const char *id)
 {
 
 	struct device_node *nvmem_np;
+	struct nvmem_device *nvmem;
 	int index = 0;
 
 	if (id)
@@ -844,7 +845,9 @@ struct nvmem_device *of_nvmem_device_get(struct device_node *np, const char *id)
 	if (!nvmem_np)
 		return ERR_PTR(-ENOENT);
 
-	return __nvmem_device_get(nvmem_np, device_match_of_node);
+	nvmem = __nvmem_device_get(nvmem_np, device_match_of_node);
+	of_node_put(nvmem_np);
+	return nvmem;
 }
 EXPORT_SYMBOL_GPL(of_nvmem_device_get);
 #endif