Revert "qemu: Check duplicate WWNs also for hotplugged disks"

Similarly to commit 5da28cc3 this check
actually does not make sense since duplicate WWNs are used e.g. when
multipathing disks.

This reverts commit 780fe4e4.

src/conf/domain_conf.c

@@ -25510,34 +25510,6 @@ virDomainDeviceInfoCheckBootIndex(virDomainDefPtr def ATTRIBUTE_UNUSED,
     return 0;
 }
 
-
-/**
- * virDomainDefGetDiskByWWN:
- * @def: domain definition
- * @wwn: wwn of a disk to find
- *
- * Returns a disk definition pointer corresponding to the given WWN identifier
- * or NULL either if @wwn was NULL or if disk with given WWN is not present in
- * the domain definition.
- */
-static virDomainDiskDefPtr
-virDomainDefGetDiskByWWN(virDomainDefPtr def,
-                         const char *wwn)
-{
-    size_t i;
-
-    if (!wwn)
-        return NULL;
-
-    for (i = 0; i < def->ndisks; i++) {
-        if (STREQ_NULLABLE(def->disks[i]->wwn, wwn))
-            return def->disks[i];
-    }
-
-    return NULL;
-}
-
-
 int
 virDomainDefCompatibleDevice(virDomainDefPtr def,
                              virDomainDeviceDefPtr dev,
@@ -25581,15 +25553,6 @@ virDomainDefCompatibleDevice(virDomainDefPtr def,
         }
     }
 
-    if (dev->type == VIR_DOMAIN_DEVICE_DISK) {
-        if (!!virDomainDefGetDiskByWWN(def, dev->data.disk->wwn)) {
-            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
-                           _("Domain already has a disk with wwn '%s'"),
-                           dev->data.disk->wwn);
-            return -1;
-        }
-    }
-
     return 0;
 }