fix: revert unintended changes

Author: ordinary-jamie

Lib/asyncio/base_events.py

@@ -956,7 +956,7 @@ async def sock_sendfile(self, sock, file, offset=0, count=None,
         try:
             return await self._sock_sendfile_native(sock, file,
                                                     offset, count)
-        except exceptions.SendfileNotAvailableError:
+        except exceptions.SendfileNotAvailableError as exc:
             if not fallback:
                 raise
         return await self._sock_sendfile_fallback(sock, file,
@@ -1269,7 +1269,7 @@ async def sendfile(self, transport, file, offset=0, count=None,
             try:
                 return await self._sendfile_native(transport, file,
                                                    offset, count)
-            except exceptions.SendfileNotAvailableError:
+            except exceptions.SendfileNotAvailableError as exc:
                 if not fallback:
                     raise