file.c: fix 64-bit conversion warnings from r60844
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60846 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
file.c: fix 64-bit conversion warnings from r60844
(rb_file_s_truncate): cast "void *" to VALUE before int
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60846 b2dd03c8-39d4-4d8f-98ff-823fe69b080e