net: airoha: fix potential use-after-free in airoha_npu_get()

np->name was being used after calling of_node_put(np), which
releases the node and can lead to a use-after-free bug.
Previously, of_node_put(np) was called unconditionally after
of_find_device_by_node(np), which could result in a use-after-free if
pdev is NULL.

This patch moves of_node_put(np) after the error check to ensure
the node is only released after both the error and success cases
are handled appropriately, preventing potential resource issues.

Fixes: 23290c7 ("net: airoha: Introduce Airoha NPU support")
Signed-off-by: Alok Tiwari <alok.a.tiwari@oracle.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20250715143102.3458286-1-alok.a.tiwari@oracle.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: aloktiwa

drivers/net/ethernet/airoha/airoha_npu.c

@@ -401,12 +401,13 @@ struct airoha_npu *airoha_npu_get(struct device *dev, dma_addr_t *stats_addr)
 		return ERR_PTR(-ENODEV);
 
 	pdev = of_find_device_by_node(np);
-	of_node_put(np);
 
 	if (!pdev) {
 		dev_err(dev, "cannot find device node %s\n", np->name);
+		of_node_put(np);
 		return ERR_PTR(-ENODEV);
 	}
+	of_node_put(np);
 
 	if (!try_module_get(THIS_MODULE)) {
 		dev_err(dev, "failed to get the device driver module\n");