Fix merge issue

Author: LucaButBoring

src/mcp/client/auth.py

@@ -621,9 +621,9 @@ async def async_auth_flow(self, request: httpx.Request) -> AsyncGenerator[httpx.
                     logger.exception("OAuth flow error")
                     raise
 
-        # Retry with new tokens
-        self._add_auth_header(request)
-        yield request
+                # Retry with new tokens
+                self._add_auth_header(request)
+                yield request
 
 
 class RFC7523OAuthClientProvider(OAuthClientProvider):