[SCSI] Add scsi_add_host() failure handling for nsp32

Add scsi_add_host() failure handling for nsp32
and silence warning.
  drivers/scsi/nsp32.c:2888: warning: ignoring return value of 'Scsi_add_host', declared with attribute warn_unused_result
Signed-off-by: NJesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: NGOTO Masanori <gotom@sanori.org>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/nsp32.c

@@ -2886,12 +2886,19 @@ static int nsp32_detect(struct scsi_host_template *sht)
         }
 
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,73))
-	scsi_add_host (host, &PCIDEV->dev);
+	ret = scsi_add_host(host, &PCIDEV->dev);
+	if (ret) {
+		nsp32_msg(KERN_ERR, "failed to add scsi host");
+		goto free_region;
+	}
 	scsi_scan_host(host);
 #endif
 	pci_set_drvdata(PCIDEV, host);
 	return DETECT_OK;
 
+ free_region:
+	release_region(host->io_port, host->n_io_port);
+
  free_irq:
 	free_irq(host->irq, data);