* marshal.c (r_bytes0): refined length check.  [ruby-dev:32059]
	* marshal.c (r_bytes0): check if source has enough data.
	  [ruby-dev:32054]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_6@16903 b2dd03c8-39d4-4d8f-98ff-823fe69b080e