dataplane: fix shadowed return value
Propagate the error return value from get_indirect(). This bug was introduced in commit 4d684832 ("vring: create a common function to parse descriptors"). Reviewed-by: NMarkus Armbruster <armbru@redhat.com> Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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