void foo() is not a valid C prototype, one has to write void foo(void)

void foo() is not a valid C prototype, one has to write void foo(void)

Remove a warning introduced in r262977

From: Mehdi Amini <mehdi.amini@apple.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@262990 91177308-0d34-0410-b5e6-96231b3b80d8