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The API returns now negative values on error and stashes the error in errno. Fix the user of this API. The 'xc_hypercall_bounce_pre' can fail - and if so it will stash its errno values - no need to over-write it. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Acked-by: Ian Campbell <ian.campbell@citrix.com>