xen-blkback: fix leak on grant map error path
commit 61cecca8 upstream. Fix leaking a page when a grant mapping has failed. Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Reported-and-Tested-by: Tao Chen <boby.chen@huawei.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Jiri Slaby <jslaby@suse.cz>
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