check udp_read_packet return value not to access uninitialized memory
patch by Eric Paul: [eric paul gmail com]
original thread: [FFmpeg-devel] [PATCH] : libavformat segfault when a
RTSP reading is interrupted
date: 07/05/2007 03:13 PM

Originally committed as revision 9492 to svn://svn.ffmpeg.org/ffmpeg/trunk
