Query: don't be confused by partition tables.

Now that we recognise partition tables as a sort of metadata
we need to be careful in --query not to say that a device
with a partition table looks like a device in an array.

Testing ->compare_super for NULL is an easy way to do that.

Signed-off-by: NeilBrown <neilb@suse.de>

Query.c

@@ -82,7 +82,7 @@ int Query(char *dev)
 		       array.spare_disks, array.spare_disks==1?"":"s");
 	}
 	st = guess_super(fd);
-	if (st)
+	if (st && st->ss->compare_super != NULL)
 		superror = st->ss->load_super(st, fd, dev);
 	else
 		superror = -1;