bcache: Remove unnecessary check in should_split()

Checking i->seq was redundant, because since ages ago we always
initialize the new bset when advancing b->written
Signed-off-by: Kent Overstreet <kmo@daterainc.com>

drivers/md/bcache/btree.h

@@ -363,8 +363,7 @@ static inline bool should_split(struct btree *b)
 {
 	struct bset *i = write_block(b);
 	return b->written >= btree_blocks(b) ||
-		(i->seq == b->sets[0].data->seq &&
-		 b->written + __set_blocks(i, i->keys + 15, b->c)
+		(b->written + __set_blocks(i, i->keys + 15, b->c)
 		 > btree_blocks(b));
 }