Fix off-by-one error in documentation for xcb_*_end
When rem=0, data is a one-past-the-end pointer. This is the correct behavior for code like:
for (; formats.rem; xcb_format_next(&formats))
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When rem=0, data is a one-past-the-end pointer. This is the correct behavior for code like:
for (; formats.rem; xcb_format_next(&formats))
...