vz: use state variable sdkdom in prlsdkApplyConfig

sdk domain handle is unique per connection so there is
no sense to query it again if we have it in vzDomObjPtr.
Side effect of prlsdkSdkDomainLookupByUUID is refreshing
domain config is of no use too as PrlVm_BeginEdit do it too.

src/vz/vz_sdk.c

@@ -3906,28 +3906,22 @@ prlsdkApplyConfig(vzDriverPtr driver,
                   virDomainObjPtr dom,
                   virDomainDefPtr new)
 {
-    PRL_HANDLE sdkdom = PRL_INVALID_HANDLE;
+    vzDomObjPtr privdom = dom->privateData;
     PRL_HANDLE job = PRL_INVALID_HANDLE;
     int ret;
 
-    sdkdom = prlsdkSdkDomainLookupByUUID(driver, dom->def->uuid);
-    if (sdkdom == PRL_INVALID_HANDLE)
-        return -1;
-
-    job = PrlVm_BeginEdit(sdkdom);
+    job = PrlVm_BeginEdit(privdom->sdkdom);
     if (PRL_FAILED(waitJob(job)))
         return -1;
 
-    ret = prlsdkDoApplyConfig(driver, sdkdom, new, dom->def);
+    ret = prlsdkDoApplyConfig(driver, privdom->sdkdom, new, dom->def);
 
     if (ret == 0) {
-        job = PrlVm_CommitEx(sdkdom, PVCF_DETACH_HDD_BUNDLE);
+        job = PrlVm_CommitEx(privdom->sdkdom, PVCF_DETACH_HDD_BUNDLE);
         if (PRL_FAILED(waitJob(job)))
             ret = -1;
     }
 
-    PrlHandle_Free(sdkdom);
-
     return ret;
 }