Fix cppcheck warnings

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I18be21d5141630a1da3d5e54740b54a9a06496d9
diff --git a/src/button_handler_main.cpp b/src/button_handler_main.cpp
index e9fcc27..e71f8e4 100644
--- a/src/button_handler_main.cpp
+++ b/src/button_handler_main.cpp
@@ -1,6 +1,6 @@
 #include "button_handler.hpp"
 
-int main(int argc, char* argv[])
+int main(void)
 {
     auto bus = sdbusplus::bus::new_default();