[SCSI] qla4xxx: return SCSI_MLQUEUE_TARGET_BUSY when driver has detected session error

When qla4xxx begins recovery and the iscsi class is firing up to handle
it, we need to retrn SCSI_MLQUEUE_TARGET_BUSY from the driver instead
of host busy, because the session recovery only affects the one target.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Acked-by: David C Somayajulu <david.somayajulu@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/qla4xxx/ql4_os.c

@@ -439,7 +439,7 @@ static int qla4xxx_queuecommand(struct scsi_cmnd *cmd,
 			cmd->result = DID_NO_CONNECT << 16;
 			goto qc_fail_command;
 		}
-		goto qc_host_busy;
+		return SCSI_MLQUEUE_TARGET_BUSY;
 	}
 
 	if (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags))