btrfs: factor out btree page submission code to a helper

In btree_write_cache_pages() we have a btree page submission routine
buried deeply in a nested loop.

This patch will extract that part of code into a helper function,
submit_eb_page(), to do the same work.

Since submit_eb_page() now can return >0 for successful extent
buffer submission, remove the "ASSERT(ret <= 0);" line.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>