Declare __FAKE_USE_VA_ARGS as a variadic function.

This avoids 2 static analysis warnings:
* assigned but unused variables in __VA_ARGS__
* unused expression result in __VA_ARGS__

Bug: 111614304
Test: make with WITH_TIDY=1
Change-Id: I4faae8787f6cc76de7ff4b6d08d25d0cb47324ea
1 file changed