Merge the circuit_{free,clear}_cpath functions

(Based on a suggestion by arma at #9777)

src/or/circuitlist.c

@@ -43,7 +43,6 @@ struct global_circuitlist_s global_circuitlist =
 /** A list of all the circuits in CIRCUIT_STATE_CHAN_WAIT. */
 static smartlist_t *circuits_pending_chans = NULL;
 
-static void circuit_free_cpath(crypt_path_t *cpath);
 static void circuit_free_cpath_node(crypt_path_t *victim);
 static void cpath_ref_decref(crypt_path_reference_t *cpath_ref);
 
@@ -728,7 +727,7 @@ circuit_free(circuit_t *circ)
     }
     tor_free(ocirc->build_state);
 
-    circuit_free_cpath(ocirc->cpath);
+    circuit_clear_cpath(ocirc);
 
     crypto_pk_free(ocirc->intro_key);
     rend_data_free(ocirc->rend_data);
@@ -787,11 +786,14 @@ circuit_free(circuit_t *circ)
   tor_free(mem);
 }
 
-/** Deallocate space associated with the linked list <b>cpath</b>. */
-static void
-circuit_free_cpath(crypt_path_t *cpath)
+/** Deallocate the linked list circ-><b>cpath</b>, and remove the cpath from
+ * <b>circ</b>. */
+void
+circuit_clear_cpath(origin_circuit_t *circ)
 {
-  crypt_path_t *victim, *head=cpath;
+  crypt_path_t *victim, *head, *cpath;
+
+  head = cpath = circ->cpath;
 
   if (!cpath)
     return;
@@ -805,13 +807,7 @@ circuit_free_cpath(crypt_path_t *cpath)
   }
 
   circuit_free_cpath_node(cpath);
-}
 
-/** Remove all the items in the cpath on <b>circ</b>.*/
-void
-circuit_clear_cpath(origin_circuit_t *circ)
-{
-  circuit_free_cpath(circ->cpath);
   circ->cpath = NULL;
 }