- use EXIT_{SUCCESS,FAILURE}. No object-code changes

shell/bbsh.c

@@ -168,7 +168,7 @@ static int run_pipeline(struct pipeline *line)
 			run_applet_and_exit(cmd->argv[0],cmd->argc,cmd->argv);
 			execvp(cmd->argv[0],cmd->argv);
 			printf("No %s",cmd->argv[0]);
-			exit(1);
+			exit(EXIT_FAILURE);
 		} else waitpid(pid, &status, 0);
 	}