Fix Argument name

Author: sudarsan2k5

pytensor/graph/basic.py

@@ -1615,8 +1615,8 @@ def expand(o: Apply) -> List[Apply]:
     )
 
 
-def is_in_ancestors(l_apply: Apply, f_node: Apply) -> bool:
-    """Determine if `f_node` is in the graph given by `l_apply`.
+def is_in_ancestors(l_apply: Apply, f_apply: Apply) -> bool:
+    """Determine if `f_apply` is in the graph given by `l_apply`.
 
     Parameters
     ----------
@@ -1638,7 +1638,7 @@ def is_in_ancestors(l_apply: Apply, f_node: Apply) -> bool:
             continue
         if all(i in computed or i.owner is None for i in cur.inputs):
             computed.update(cur.outputs)
-            if cur is f_node:
+            if cur is f_apply:
                 return True
         else:
             todo.append(cur)