call close on the underlying stream even if flush raises (#16597)

Lib/_pyio.py

@@ -340,8 +340,10 @@ class IOBase:
         This method has no effect if the file is already closed.
         """
         if not self.__closed:
-            self.flush()
-            self.__closed = True
+            try:
+                self.flush()
+            finally:
+                self.__closed = True
 
     def __del__(self):
         """Destructor.  Calls close()."""
@@ -1568,8 +1570,10 @@ class TextIOWrapper(TextIOBase):
 
     def close(self):
         if self.buffer is not None and not self.closed:
-            self.flush()
-            self.buffer.close()
+            try:
+                self.flush()
+            finally:
+                self.buffer.close()
 
     @property
     def closed(self):