The sscanf return value is verified whether the three channel variables, i.e. start channel, end channel and channel band, are properly updated. If malformed input is given to sscanf, then these variables may not properly updated. To provide validation of input, verifying that sscanf returned a correct value of 3. Change-Id: Ibd185e7a0ffcf5803927990531fc33f0e8977cc9 CRs-fixed: 554349