merge revision(s) 39376: [Backport #7903]

	* random.c (rb_random_ulong_limited): fix error message for negative
	  value.  [ruby-dev:47061] [Bug #7903]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39674 b2dd03c8-39d4-4d8f-98ff-823fe69b080e