intel: protect against empty invalidate ranges

intel: protect against empty invalidate ranges

It's legal for an application to call vkInvalidateMappedMemoryRanges()
/ vkFlushMappedMemoryRanges() with zero sized ranges.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: b91971c240d3 ("anv: use the right helper to invalidate memory")
Cc: mesa-stable
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/6852
Reviewed-by: Marcin Ślusarz <marcin.slusarz@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17481>