Segfault because of Out-of-Bound Read

[GanbaruTobi]

I tested this lib with AdressSanitizer.
Its likely to crash because of the referenced condition, which will just happily read behind the strings length.

cxml/cxml.c

Lines 160 to 162 in 36f7e51

	while(str.str[str.length] != '"' && str.str[str.length] != '\'') {
	str.length++;
	}