Issue #27911: Remove some unnecessary error checks in import.c.

Thanks to Xiang Zhang for the patch.

Misc/NEWS

@@ -10,6 +10,9 @@ What's New in Python 3.6.0 beta 1
 Core and Builtins
 -----------------
 
+- Issue #27911: Remove unnecessary error checks in
+  import.c:exec_builtin_or_dynamic().
+
 - Issue #27983: Cause lack of llvm-profdata tool when using clang as
   required for PGO linking to be a configure time error rather than
   make time when --with-optimizations is enabled.  Also improve our

Python/import.c

@@ -1942,19 +1942,15 @@ exec_builtin_or_dynamic(PyObject *mod) {
 
     def = PyModule_GetDef(mod);
     if (def == NULL) {
-        if (PyErr_Occurred()) {
-            return -1;
-        }
         return 0;
     }
+
     state = PyModule_GetState(mod);
-    if (PyErr_Occurred()) {
-        return -1;
-    }
     if (state) {
         /* Already initialized; skip reload */
         return 0;
     }
+
     return PyModule_ExecDef(mod, def);
 }