[xmonad] Issue 363 in xmonad: non-positive argument error on NVidia Xinerama set

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Comment #9 on issue 363 by ilya.por... at gmail.com: non-positive argument  
error on NVidia Xinerama set
http://code.google.com/p/xmonad/issues/detail?id=363

So, seems xmonad needs to do some checks on startup: if (number of  
workspaces) < (number of xinerama screens) then add some additional  
workspaces. The patch is quite trivial.