string.c: Supress logical-op-parentheses warning
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58211 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
string.c: Supress logical-op-parentheses warning
Patch by Fukuo Kadota fukuo-kadota@cookpad.com,
Closes [GH-1570] [Bug #13387].
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58211 b2dd03c8-39d4-4d8f-98ff-823fe69b080e