Remove a useless import and reading types are unsigned.
Remove a useless import and reading types are unsigned.

git-svn-id: 14367e9ad048ee2de8de43f368ccbd32da08ce87@3357 2dde4cc4-cf3c-0410-b1a3-a9b8ff274da5

thijstriemstra/pyamf,njoyce/pyamf,njoyce/pyamf,hydralabs/pyamf,hydralabs/pyamf,thijstriemstra/pyamf