block/vhdx.c: Mark parent_vhdx_guid variable as unused
The parent_vhdx_guid variable is defined but never used, which provokes complaints from newer versions of clang. Since the variable definition is here acting as documentation of the image format, mark it with the 'unused' attribute to keep the compiler happy rather than simply deleting it. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NFam Zheng <famz@redhat.com> Reviewed-by: NJeff Cody <jcody@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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