* bignum.c (biglsh_bang): Fix bignum digits under-run.

	* bignum.c (bigrsh_bang): Fix bignum digits overrun.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@41944 b2dd03c8-39d4-4d8f-98ff-823fe69b080e