bake: fix loop references

Signed-off-by: Justin Chadwell <me@jedevc.com>
(cherry picked from commit 48357ee0c6)

bake/remote.go

@@ -34,9 +34,9 @@ func ReadRemoteFiles(ctx context.Context, nodes []builder.Node, url string, name
 	var files []File
 
 	var node *builder.Node
-	for _, n := range nodes {
+	for i, n := range nodes {
 		if n.Err == nil {
-			node = &n
+			node = &nodes[i]
 			continue
 		}
 	}