Fix the line count calculation

[LTLA]

at

kaori/include/kaori/FastqReader.hpp

Lines 68 to 77 in 5d3214a

	// Processing the sequence itself until we get to a '+'.
	sequence.clear();
	val = advance_and_check();
	while (val != '+') {
	if (val != '\n') {
	sequence.push_back(val);
	}
	val = advance_and_check();
	}
	++line_count;

it's probably unnecesarry to check val != '+' at each iteration, given that should only happen after a newline.