sprintf.c: fix condition
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47222 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
sprintf.c: fix condition
[ruby-core:64454] [Bug #10151]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47222 b2dd03c8-39d4-4d8f-98ff-823fe69b080e