cleanup _Unpickler_SkipConsumed(): remove 1 level of indentation

Modules/_pickle.c

@@ -872,18 +872,21 @@ _Unpickler_SetStringInput(UnpicklerObject *self, PyObject *input)
 static int
 _Unpickler_SkipConsumed(UnpicklerObject *self)
 {
-    Py_ssize_t consumed = self->next_read_idx - self->prefetched_idx;
-
-    if (consumed > 0) {
+    Py_ssize_t consumed;
     PyObject *r;
+
+    consumed = self->next_read_idx - self->prefetched_idx;
+    if (consumed <= 0)
+        return 0;
+
     assert(self->peek);  /* otherwise we did something wrong */
     /* This makes an useless copy... */
     r = PyObject_CallFunction(self->read, "n", consumed);
     if (r == NULL)
         return -1;
     Py_DECREF(r);
+
     self->prefetched_idx = self->next_read_idx;
-    }
     return 0;
 }