Ensure to zero out the virDomainBlockJobInfo arg

The virDomainGetBlockJobInfo method did not zero out the
virDomainBlockJobInfo pointer arg, so when block jobs were
not active it would return garbage for the bandwidth/cur/end
fields.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

src/libvirt.c

@@ -20850,6 +20850,8 @@ int virDomainGetBlockJobInfo(virDomainPtr dom, const char *disk,
     virCheckNonNullArgGoto(disk, error);
     virCheckNonNullArgGoto(info, error);
 
+    memset(info, 0, sizeof(*info));
+
     if (conn->driver->domainGetBlockJobInfo) {
         int ret;
         ret = conn->driver->domainGetBlockJobInfo(dom, disk, info, flags);