scsi: csiostor: Remove set but not used variable 'rln'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/scsi/csiostor/csio_lnode.c: In function 'csio_ln_init':
drivers/scsi/csiostor/csio_lnode.c:1995:21: warning:
variable 'rln' set but not used [-Wunused-but-set-variable]

It is never used since introduction, so remove it.

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: YueHaibing <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/csiostor/csio_lnode.c

···
 csio_ln_init(struct csio_lnode *ln)
 {
 	int rv = -EINVAL;
-	struct csio_lnode *rln, *pln;
+	struct csio_lnode *pln;
 	struct csio_hw *hw = csio_lnode_to_hw(ln);
 
 	csio_init_state(&ln->sm, csio_lns_uninit);
···
 		 * THe rest is common for non-root physical and NPIV lnodes.
 		 * Just get references to all other modules
 		 */
-		rln = csio_root_lnode(ln);
 
 		if (csio_is_npiv_ln(ln)) {
 			/* NPIV */