bug22375: unchunking and unexpected eof

DEVICE-READ on UNCHUNKING-STREAM of aserve used to call READ-SEQUENCE
in a tight loop if an unexpected eof was encountered in the middle of
a chunk.

Make it use READ-VECTOR instead whose b/nb behavior is a better match
and signal an error if it reads nothing.

Bump patch version.

Change-Id: Ief2286d5cce24224ada68daf9b57b8dc91d7c065