trickery bulletproofing

Prevent the pardoning of trickery in wizard mode from attempting
to continue when there's no longer any current level.  Also prevent
the ZEROCOMP configuration from trying to read from file descriptor -1
in case there're any other places which still let that slip through.
And fix an oddity in the VMS port's error() routine which has gone
unnoticed for years.

doc/fixes34.1

@@ -220,6 +220,8 @@ If there were a hole outside a shop, you could kick stuff out of the door
 curing hallucination while wielding Grayswandir should print a message
 removing unowned pick-axe from container in shop gave inappropriate message
 don't let monster end up with more current HP than max HP after life drain
+make sure that missing file trickery in wizard mode which is discovered during
+	level change doesn't try to keep going after discarding current level
 
 
 Platform- and/or Interface-Specific Fixes
@@ -262,6 +264,7 @@ Gnome/Linux: more portable getres*id workaround
 msdos: compiling without NO_TERMS resulted in a link-time error
 msdos: reworked Makefile.GCC to get rid of need to duplicate source files
 msdos,win32: stop doing chdir when NOCWD_ASSUMPTIONS is defined
+vms: prevent error() from indirectly triggering hangup save during forced exit
 
 
 General New Features