modify stdout, delete pool.py

Author: joyguoguo

fuzz/fuzz_runner_pool.py

@@ -60,8 +60,11 @@ def run_command(
             errors="replace"
         )
         with open(log_file, "a", encoding="utf-8") as f:
-            for line in iter(process.stdout.readline, ""):
-                f.write(line)
+           if process.stdout is not None:
+                for line in iter(process.stdout.readline, ""):
+                    f.write(line)
+            else:
+                log_and_print("⚠️ Warning: process.stdout is None", log_file)
         process.wait()
         return process.returncode in [0, *allowed_exit_codes]
     except Exception as e: