conf: Resolve corner case on fc_host deletion

https://bugzilla.redhat.com/show_bug.cgi?id=1420740

Testing found an inventive way to cause an error at shutdown by providing the
parent name for the fc host creation using the "same name" as the HBA. Since
the code thus assumed the parent host name provided was the parent HBA and
just extracted out the host number and sent that along to the vport_destroy
this avoided checks made for equality.

So just add the equality check to that path to resolve.

src/conf/node_device_conf.c

@@ -2301,17 +2301,25 @@ virNodeDeviceDeleteVport(virConnectPtr conn,
         goto cleanup;
     }
 
+    if (virAsprintf(&scsi_host_name, "scsi_%s", name) < 0)
+        goto cleanup;
+
     /* If at startup time we provided a parent, then use that to
      * get the parent_host value; otherwise, we have to determine
      * the parent scsi_host which we did not save at startup time
      */
     if (fchost->parent) {
+        /* Someone provided a parent string at startup time that
+         * was the same as the scsi_host - meaning we have a pool
+         * backed to an HBA, so there won't be a vHBA to delete */
+        if (STREQ(scsi_host_name, fchost->parent)) {
+            ret = 0;
+            goto cleanup;
+        }
+
         if (virSCSIHostGetNumber(fchost->parent, &parent_host) < 0)
             goto cleanup;
     } else {
-        if (virAsprintf(&scsi_host_name, "scsi_%s", name) < 0)
-            goto cleanup;
-
         if (!(vhba_parent = virNodeDeviceGetParentName(conn, scsi_host_name)))
             goto cleanup;