PyErr_Display(), PyErr_WriteUnraisable(): Coverity found a cut-and-paste

bug in both:  `className` was referenced before being checked for NULL.

1 files changed, 8 insertions, 5 deletions

diff --git a/Python/errors.c b/Python/errors.c
index f7a1c08f54..a40f073788 100644
--- a/Python/errors.c
+++ b/Python/errors.c
@@ -588,13 +588,16 @@ PyErr_WriteUnraisable(PyObject *obj)
 	if (f != NULL) {
 		PyFile_WriteString("Exception ", f);
 		if (t) {
-			char* className = PyExceptionClass_Name(t);
 			PyObject* moduleName;
-			char *dot = strrchr(className, '.');
-			if (dot != NULL)
-				className = dot+1;
-			moduleName = PyObject_GetAttrString(t, "__module__");
+			char* className = PyExceptionClass_Name(t);
 
+			if (className != NULL) {
+				char *dot = strrchr(className, '.');
+				if (dot != NULL)
+					className = dot+1;
+			}
+
+			moduleName = PyObject_GetAttrString(t, "__module__");
 			if (moduleName == NULL)
 				PyFile_WriteString("<unknown>", f);
 			else {