of: fix reference count leak in of_alias_scan()

of_find_node_by_path() returns a device_node with its refcount
incremented. When kstrtoint() fails or dt_alloc() fails, the function
continues to the next iteration without calling of_node_put(), causing
a reference count leak.

Add of_node_put(np) before continue on both error paths to properly
release the device_node reference.

Fixes: 611cad7 ("dt: add of_alias_scan and of_alias_get_id")
Cc: stable@vger.kernel.org
Signed-off-by: Weigang He <geoffreyhe2@gmail.com>
Link: https://patch.msgid.link/20260117091238.481243-1-geoffreyhe2@gmail.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

Author: Weigang He

drivers/of/base.c

@@ -1942,13 +1942,17 @@ void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align))
 			end--;
 		len = end - start;
 
-		if (kstrtoint(end, 10, &id) < 0)
+		if (kstrtoint(end, 10, &id) < 0) {
+			of_node_put(np);
 			continue;
+		}
 
 		/* Allocate an alias_prop with enough space for the stem */
 		ap = dt_alloc(sizeof(*ap) + len + 1, __alignof__(*ap));
-		if (!ap)
+		if (!ap) {
+			of_node_put(np);
 			continue;
+		}
 		memset(ap, 0, sizeof(*ap) + len + 1);
 		ap->alias = start;
 		of_alias_add(ap, np, id, start, len);