Remove check for timeout < 0 + rm test case which didn't make sense.

Author: giampaolo

Lib/subprocess.py

@@ -2153,8 +2153,7 @@ def _wait(self, timeout):
                 return self.returncode
 
             if timeout is not None:
-                if timeout < 0:
-                    raise TimeoutExpired(self.args, timeout)
+                # Try fast wait first (pidfd on Linux, kqueue on BSD/macOS).
                 if self._wait_pidfd(timeout) or self._wait_kqueue(timeout):
                     self._blocking_wait()
                 else:

Lib/test/test_subprocess.py

@@ -163,12 +163,6 @@ def test_call_timeout(self):
                           timeout=0.1)
 
     def test_timeout_exception(self):
-        try:
-            subprocess.run([sys.executable, '-c', 'import time;time.sleep(9)'], timeout = -1)
-        except subprocess.TimeoutExpired as e:
-            self.assertIn("-1 seconds", str(e))
-        else:
-            self.fail("Expected TimeoutExpired exception not raised")
         try:
             subprocess.run([sys.executable, '-c', 'import time;time.sleep(9)'], timeout = 0)
         except subprocess.TimeoutExpired as e: