twister: do not use twister internals for reason field

Do not use twister internals for reason field.

Signed-off-by: Anas Nashif <[email protected]>

Author: nashif

scripts/pylib/twister/twisterlib/handlers.py

@@ -390,7 +390,7 @@ def handle(self, harness):
             self.returncode = proc.returncode
             if proc.returncode != 0:
                 self.instance.status = TwisterStatus.ERROR
-                self.instance.reason = f"BinaryHandler returned {proc.returncode}"
+                self.instance.reason = f"rc={proc.returncode}"
             self.try_kill_process_by_pid()
 
         self.execution_time = time.time() - start_time