fgui now aborts with a diagnostic if it cannot create its hidden window.
stops stupid people like me from starting it from $home/profile.

Reference: /n/sources/patch/applied/fgui-diagnostic
Date: Wed Oct 26 15:13:36 CES 2005

--- /sys/src/cmd/auth/factotum/fgui.c	Wed Oct 26 14:42:13 2005
+++ /sys/src/cmd/auth/factotum/fgui.c	Wed Oct 26 14:42:11 2005
@@ -76,7 +76,8 @@
 	ARGBEGIN{
 	}ARGEND;
 
-	newwindow("-hide");
+	if (newwindow("-hide") < 0)
+		sysfatal("newwindow() failed - no window manager?");
 
 	fmtinstall('A', _attrfmt);