Quadratic loop in PentaxMakerNote::printVersion

[kevinbackhouse]

Credit to OSS-Fuzz: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=38887

The loop in printVersion is quadratic, because it keeps searching from the start of the string:

while ((i = val.find(' ')) != std::string::npos && i != val.length() - 1) {
    val.replace(i, 1, ".");
}

poc: poc.tar.gz