scsi: zfcp: more fitting constant for fc_ct_hdr.ct_reason on port scan response

v2.6.33 commit dbf5dfe9 ("[SCSI] zfcp: Use common code definitions for
FC CT structs") replaced own definitions with common code definitions.
While FC_BA_RJT_UNABLE happens to be defined with the same value 9 as
FC_FS_RJT_UNABL and thus also works, here we should use the latter from
fc_gs.h.
See also its use in libfc's fc_disc_gpn_ft_resp().
Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: Benjamin Block <bblock@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/s390/scsi/zfcp_fc.c

@@ -3,7 +3,7 @@
  *
  * Fibre Channel related functions for the zfcp device driver.
  *
- * Copyright IBM Corp. 2008, 2010
+ * Copyright IBM Corp. 2008, 2017
  */
 
 #define KMSG_COMPONENT "zfcp"
@@ -667,7 +667,7 @@ static int zfcp_fc_eval_gpn_ft(struct zfcp_fc_req *fc_req,
 		return -EIO;
 
 	if (hdr->ct_cmd != FC_FS_ACC) {
-		if (hdr->ct_reason == FC_BA_RJT_UNABLE)
+		if (hdr->ct_reason == FC_FS_RJT_UNABL)
 			return -EAGAIN; /* might be a temporary condition */
 		return -EIO;
 	}