This is a typo, if pvolume_info were NULL it would oops.

This function is used in clean up and error handling.  The current code
never passes a NULL pvolume_info, but it could pass a NULL *pvolume_info
if the kmalloc() failed.
Signed-off-by: NDan Carpenter <error27@gmail.com>
Acked-by: NJeff Layton <jlayton@redhat.com>
Signed-off-by: NSteve French <sfrench@us.ibm.com>