Fixed format

Author: H-G-Hristov

libcxx/test/std/input.output/span.streams/helper_types.h

@@ -141,5 +141,4 @@ class spanbuf_wrapper : public std::basic_spanbuf<CharT, TraitsT> {
   using std::basic_spanbuf<CharT, TraitsT>::pptr;
 };
 
-
 #endif // TEST_STD_INPUTOUTPUT_SPANSTREAMS_TYPES_H