clang-format: Fix incorrect function type detection.

Before:
  returnsFunction (&param1, &param2)(param);

After:
  returnsFunction(&param1, &param2)(param);

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@272538 91177308-0d34-0410-b5e6-96231b3b80d8