Update cmpsc.c

CMPSC could return CC1 incorrectly, though it's never been reported.

The original test was if(bufferlength < 2 && enough bits). It was wrongly changed to if(bufferlength < 2 || enough bits). It is currently corrected to if(bufferlength < 3 && enough bits), saying a) no CC1 for bufferlengths longer than 2 bytes or b) no CC1 for bufferlength 1 or 2 bytes AND enough bits or c) CC1 for bufferlength 1 or 2 AND not enough bits.

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