xen-pciback: drop superfluous variables
req_start is simply an alias of the "offset" function parameter, and req_end is being used just once in each function. (And both variables were loop invariant anyway, so should at least have got initialized outside the loop.) Signed-off-by: NJan Beulich <jbeulich@suse.com> Signed-off-by: NDavid Vrabel <david.vrabel@citrix.com>
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