Support: Return void from Scanner::scan_ns_uri_char, no one uses the result

Simplify this a little bit since the result is never used. It can be
added back easily enough if that changes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284348 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed