Change ch to an int instead of a char. Fixes xstatbar on PowerPC #10
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…e a char ranges from 0 to 255, but getopt(3) returns -1.
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On PowerPC, xstatbar prints out its usage and exits regardless of the options given because a char on PowerPC ranges from 0 to 255, but getopt() is trying to return a -1 here. This minor change fixes it.