merge revision(s) 57108: [Backport #13121]
sprintf.c: fix width underflow * sprintf.c (rb_str_format): fix memory corruption by width
underflow. https://github.com/mruby/mruby/issues/3347
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@57340 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 57108: [Backport #13121]
underflow. https://github.com/mruby/mruby/issues/3347
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@57340 b2dd03c8-39d4-4d8f-98ff-823fe69b080e