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Use the common utility function, which contains checks on return values and first calls F_GETFD as recommended by POSIX.1-2001, instead of manually calling fcntl. CID: 1374831 Signed-off-by: Stefano Stabellini <sstabellini@kernel.org> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Greg Kurz <groug@kaod.org> CC: anthony.perard@citrix.com CC: groug@kaod.org CC: aneesh.kumar@linux.vnet.ibm.com CC: Eric Blake <eblake@redhat.com>