Fix missing returns in libstdc++ header and tests
* include/bits/locale_conv.h (wbuffer_convert::_M_put): Add missing
return statement.
* testsuite/21_strings/basic_string_view/operations/copy/char/1.cc:
Return void.
* testsuite/21_strings/basic_string_view/operations/copy/wchar_t/1.cc:
Likewise.
* testsuite/23_containers/map/modifiers/insert_or_assign/1.cc: Add
missing return statements.
* testsuite/23_containers/unordered_map/modifiers/insert_or_assign.cc:
Likewise.
* testsuite/27_io/basic_istream/extractors_arithmetic/char/12.cc:
Return void.
* testsuite/special_functions/14_expint/pr68397.cc: Likewise.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@249238 138bc75d-0d04-0410-961f-82ee72b054a4