Revert my commit 7ba176c2f558: "Avoid useless "++" at the end of functions

Warnings found by the Clang Static Analyzer."

Most people prefer ++ at the end of functions.
diff --git a/Objects/setobject.c b/Objects/setobject.c
index ebfddb3..2e62518 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -616,7 +616,7 @@
     Py_UNICODE_COPY(u, PyUnicode_AS_UNICODE(listrepr)+1,
                        newsize-2);
     u += newsize-2;
-    *u = '}';
+    *u++ = '}';
     Py_DECREF(listrepr);
 
     if (Py_TYPE(so) != &PySet_Type) {
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 309159c..4361908 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -6474,7 +6474,7 @@
         }
     }
     /* 0-terminate the output string */
-    *output = '\0';
+    *output++ = '\0';
     Py_XDECREF(exc);
     Py_XDECREF(errorHandler);
     return 0;