clang-format: Fix expression parser not closing stuff at end of stmt.

Uncovered by a Java test case:

Before:
  public some.package.Type someFunction( // comment
      int parameter) {}

After:
  public some.package.Type someFunction( // comment
                          int parameter) {}

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@223228 91177308-0d34-0410-b5e6-96231b3b80d8