expr: remove support for evaluating string as integer As the comment nicely puts it, this is a bit weird. When you try to evaluate an expression of type string into an integer, what it does is: "" -> 0 "c" -> (ascii value, i.e. like a char literal) more than one char -> error The first one is obviously not very useful; why not just write 0? The second one might be useful (though I don't see where in a keymap it would be), but I don't think anyone would consider trying "X" for that anyway. A look through xkeyboard-config shows "" only used once as a string, and "X" also only used as strings (and mostly in geometry which we don't evaluate anyway). And I seriously doubt it's used (purposely) anywhere else. So remove it. Signed-off-by: Ran Benita <ran234@gmail.com>