* complex.c (nucomp_marshal_load): raise error on invalid data.
	  reported by John Firebaugh [ruby-core:42860] [Bug #6076]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@34806 b2dd03c8-39d4-4d8f-98ff-823fe69b080e