Fix CVE-2017-11332, CVE-2017-11358, CVE-2017-11359
    
    Divide by zero in startread function in wav.c" (CVE-2017-11332)
    Invalid memory read in read_samples function in hcom.c" (CVE-2017-11358)
    Divide by zero in wavwritehdr function in wav.c" (CVE-2017-11359)
    
    Resolves: #1480674, #1480675, #1480676, #1480678