Fix C++ style function definition
Fix C++ style function definition

If C function arguments are not specified, it can't be known if the
function takes no arguments or unspecified number/type of arguments
and gcc issues warnings about these when -Wstrict-prototypes and/or
-Wold-style-definition options are used.

Add void arg to disambiguate function type.

mlehtima/mce,spiiroin/mce,mlehtima/mce,spiiroin/mce,mlehtima/mce,maikelwever/mce,spiiroin/mce,maikelwever/mce,maikelwever/mce,maikelwever/mce,spiiroin/mce,mlehtima/mce