Issue #8914: fix various warnings from the Clang static analyzer v254.
diff --git a/Python/ceval.c b/Python/ceval.c
index c10a2ff..9572918 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -2690,7 +2690,7 @@
                 Py_DECREF(*pfunc);
                 *pfunc = self;
                 na++;
-                n++;
+                /* n++; */
             } else
                 Py_INCREF(func);
             sp = stack_pointer;
@@ -3026,7 +3026,7 @@
                                 PyTrace_RETURN, retval)) {
                 Py_XDECREF(retval);
                 retval = NULL;
-                why = WHY_EXCEPTION;
+                /* why = WHY_EXCEPTION; */
             }
         }
     }