* string.c (rb_str_succ): use ONIGENC_MBCLEN_CHARFOUND_P correctly.

* string.c (rb_str_dump): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41768 b2dd03c8-39d4-4d8f-98ff-823fe69b080e