cifs: replace kvec array in readdata with a single kvec

The array is no longer needed. We just need a single kvec to hold the
header for signature checking.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 93e1620..79e8b6f 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -981,10 +981,9 @@
 	int (*read_into_pages)(struct TCP_Server_Info *server,
 				struct cifs_readdata *rdata,
 				unsigned int len);
+	struct kvec			iov;
 	unsigned int			pagesz;
 	unsigned int			tailsz;
-	unsigned int			nr_iov;
-	struct kvec			*iov;
 	unsigned int			nr_pages;
 	struct page			*pages[];
 };