server: fix pod retrieval during volume attach

Fixes issue highlighted in apache#9315 (comment)

Signed-off-by: Abhishek Kumar <[email protected]>

Author: shwstppr

server/src/main/java/com/cloud/storage/VolumeApiServiceImpl.java

@@ -2429,7 +2429,7 @@ protected VolumeVO getVmExistingVolumeForVolumeAttach(UserVmVO vm, VolumeInfo vo
     protected StoragePool getPoolForAllocatedOrUploadedVolumeForAttach(final VolumeInfo volumeToAttach, final UserVmVO vm) {
         DataCenter zone = _dcDao.findById(vm.getDataCenterId());
         Pair<Long, Long> clusterHostId = virtualMachineManager.findClusterAndHostIdForVm(vm, false);
-        long podId = vm.getPodIdToDeployIn();
+        Long podId = vm.getPodIdToDeployIn();
         if (clusterHostId.first() != null) {
             Cluster cluster = clusterDao.findById(clusterHostId.first());
             podId = cluster.getPodId();