Fixes two nasty problems, both pointed out by Bill Nowicki at Stanford:

Fixes two nasty problems, both pointed out by Bill Nowicki at Stanford:
I/O errors on input in collect would cause infinite loops, and a protocol
error (or other error that would call smtpquit abnormally) would cause
core dumps

SCCS-vsn: usr.sbin/sendmail/src/deliver.c 4.4
SCCS-vsn: usr.sbin/sendmail/src/collect.c 4.2
SCCS-vsn: usr.sbin/sendmail/src/util.c 4.3
SCCS-vsn: usr.sbin/sendmail/src/version.c 4.21
SCCS-vsn: usr.sbin/sendmail/src/usersmtp.c 4.7