Correct return code from builtin_run_command_list()

The return code is not consistent with cli_simple_run_command_list(). For the
last command in a sequence, the return code is actually inverted.

Fix it.
Signed-off-by: Simon Glass <sjg@chromium.org>

common/cli_simple.c

@@ -331,7 +331,7 @@ int cli_simple_run_command_list(char *cmd, int flag)
 		++next;
 	}
 	if (rcode == 0 && *line)
-		rcode = (cli_simple_run_command(line, 0) >= 0);
+		rcode = (cli_simple_run_command(line, 0) < 0);
 
 	return rcode;
 }