error reporting

error reporting

SCCS-vsn: usr.bin/window/wwiomux.c 3.2
SCCS-vsn: usr.bin/window/wwspawn.c 3.3
SCCS-vsn: usr.bin/window/wwinit.c 3.9
SCCS-vsn: usr.bin/window/wwopen.c 3.8
SCCS-vsn: usr.bin/window/ww.h 3.11
SCCS-vsn: usr.bin/window/cmd.c 3.8
SCCS-vsn: usr.bin/window/cmd1.c 3.9
SCCS-vsn: usr.bin/window/wwtty.c 3.4
SCCS-vsn: usr.bin/window/wwwrite.c 3.9
SCCS-vsn: usr.bin/window/cmd2.c 3.10
SCCS-vsn: usr.bin/window/wwlabel.c 3.6
SCCS-vsn: usr.bin/window/startup.c 3.5
SCCS-vsn: usr.bin/window/ttinit.c 3.6
SCCS-vsn: usr.bin/window/lcmd1.c 3.6
SCCS-vsn: usr.bin/window/wwalloc.c 3.4
SCCS-vsn: usr.bin/window/wwpty.c 3.3