qemu: migration: Access job name from job struct

qemuMigrationSrcNBDCopyCancelOne uses the block job data structure but
generated it's own job name rather than taking it from the block job
data.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

src/qemu/qemu_migration.c

@@ -649,7 +649,6 @@ qemuMigrationSrcNBDCopyCancelOne(virQEMUDriverPtr driver,
                                  qemuDomainAsyncJob asyncJob)
 {
     qemuDomainObjPrivatePtr priv = vm->privateData;
-    char *diskAlias = NULL;
     int ret = -1;
     int status;
     int rv;
@@ -668,13 +667,10 @@ qemuMigrationSrcNBDCopyCancelOne(virQEMUDriverPtr driver,
         goto cleanup;
     }
 
-    if (!(diskAlias = qemuAliasDiskDriveFromDisk(disk)))
-        return -1;
-
     if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
         goto cleanup;
 
-    rv = qemuMonitorBlockJobCancel(priv->mon, diskAlias);
+    rv = qemuMonitorBlockJobCancel(priv->mon, job->name);
 
     if (qemuDomainObjExitMonitor(driver, vm) < 0 || rv < 0)
         goto cleanup;
@@ -682,7 +678,6 @@ qemuMigrationSrcNBDCopyCancelOne(virQEMUDriverPtr driver,
     ret = 0;
 
  cleanup:
-    VIR_FREE(diskAlias);
     return ret;
 }