Possible infinite loop in benchmarking code

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When y == 0.0, than there is infinite loop in the print_number function:

chacha20poly1305/bench.c

Lines 40 to 46 in 795aa44

	if (y < 0.0) {
	y = -y;
	}
	while (y < 100.0) {
	y *= 10.0;
	c++;
	}