no LOG_DEBUG when not in stream

QnetModem.cpp

@@ -749,11 +749,13 @@ bool CQnetModem::ProcessModem(const SMODEM &frame)
 		}
 
 	} else {
+		if (in_stream) {
 			fprintf(stderr, "Warning! Unexpected frame: %02x", frame.start);
 			for (unsigned int i=1U; i<frame.length; i++)
 				fprintf(stderr, ":%02x", *(&frame.start + i));
 			fprintf(stderr, "\n");
 		}
+	}
 
 	return false;
 }