complex.c: multiply as rotation
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49723 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
complex.c: multiply as rotation
if matrix calculation resulted in NaN.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49723 b2dd03c8-39d4-4d8f-98ff-823fe69b080e