[dwm] First dwm crash ever!

[Jeremy O'Brien]

Not sure what I did to get dwm to do this, but whenever I hit my modkey 
followed by '0' to show all windows on all views, dwm just up and crashes! 
I'm running dwm-4.3 with the bottomstack, viewlast and viewmode patches. And 
here's my config.h: http://pohl.ececs.uc.edu/~jeremy/config.h  Anything look 
fishy? The bug is 100% reproducable every time I hit mod-0. Thank you!