clang-format: Fix bug in pointer detection

Before:
  for (int i = 0; i* 2 < z; i *= 2) {}
After:
  for (int i = 0; i * 2 < z; i *= 2) {}

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@190546 91177308-0d34-0410-b5e6-96231b3b80d8