limited range of the data type.
The only new warning this causes (if i didnt miss one) is:
udp.c:272: warning: comparison of unsigned expression < 0 is always false
which is a real bug


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@11839 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b