Fix formatting

Author: Falron98

tests/validation/mtl_engine/RxTxApp.py

@@ -792,9 +792,7 @@ def execute_perf_test(
         cp.wait()
 
     # Enhanced logging for process completion
-    logger.info(
-        f"Performance RxTxApp process completed with return code: {cp.return_code}"
-    )
+    logger.info(f"Performance RxTxApp was killed with signal {-cp.return_code}")
 
     # Check if process was killed or terminated unexpectedly
     if cp.return_code < 0: