bfa: fix bfa_fcb_itnim_alloc() error handling

The caller assumes that "itnim" is NULL on error and non-NULL on success
but really "itnim" is uninitialized on error. This function should just
use normal error handling where it returns zero on success and negative
on failure.

Signed-off-by: Dan Carpenter <[e-mail]>
Acked-by: Anil Gurumurthy <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/bfa/bfa_fcs.h

···
 /*
  * itnim callbacks
  */
-void bfa_fcb_itnim_alloc(struct bfad_s *bfad, struct bfa_fcs_itnim_s **itnim,
-			 struct bfad_itnim_s **itnim_drv);
+int bfa_fcb_itnim_alloc(struct bfad_s *bfad, struct bfa_fcs_itnim_s **itnim,
+			struct bfad_itnim_s **itnim_drv);
 void bfa_fcb_itnim_free(struct bfad_s *bfad,
 			struct bfad_itnim_s *itnim_drv);
 void bfa_fcb_itnim_online(struct bfad_itnim_s *itnim_drv);

drivers/scsi/bfa/bfa_fcs_fcpim.c

···
 	struct bfa_fcs_lport_s *port = rport->port;
 	struct bfa_fcs_itnim_s *itnim;
 	struct bfad_itnim_s   *itnim_drv;
+	int ret;
 
 	/*
 	 * call bfad to allocate the itnim
 	 */
-	bfa_fcb_itnim_alloc(port->fcs->bfad, &itnim, &itnim_drv);
-	if (itnim == NULL) {
+	ret = bfa_fcb_itnim_alloc(port->fcs->bfad, &itnim, &itnim_drv);
+	if (ret) {
 		bfa_trc(port->fcs, rport->pwwn);
 		return NULL;
 	}

drivers/scsi/bfa/bfad_im.c

···
  * BFA FCS itnim alloc callback, after successful PRLI
  * Context: Interrupt
  */
-void
+int
 bfa_fcb_itnim_alloc(struct bfad_s *bfad, struct bfa_fcs_itnim_s **itnim,
 		    struct bfad_itnim_s **itnim_drv)
 {
 	*itnim_drv = kzalloc(sizeof(struct bfad_itnim_s), GFP_ATOMIC);
 	if (*itnim_drv == NULL)
-		return;
+		return -ENOMEM;
 
 	(*itnim_drv)->im = bfad->im;
 	*itnim = &(*itnim_drv)->fcs_itnim;
···
 	 */
 	INIT_WORK(&(*itnim_drv)->itnim_work, bfad_im_itnim_work_handler);
 	bfad->bfad_flags |= BFAD_RPORT_ONLINE;
+	return 0;
 }
 
 /*