xen-scsiback: define a pr_fmt macro with xen-pvscsi
Add the {xen-pvscsi: } prefix in pr_fmt and remove DPRINTK, then replace all DPRINTK with pr_debug. Also fixed up some comments just as eliminate redundant whitespace and format the code. These will make the code easier to read. Signed-off-by: NTao Chen <boby.chen@huawei.com> Reviewed-by: NJuergen Gross <jgross@suse.com> Signed-off-by: NDavid Vrabel <david.vrabel@citrix.com>
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