btrfs: remove the alignment check in end_bbio_data_write()

The check is not necessary because:

- There is already assert_bbio_alignment() at btrfs_submit_bbio()

- There is also btrfs_subpage_assert() for all btrfs_folio_*() helpers

- The original commit mentions the check may go away in the future
  Commit 17a5adccf3 ("btrfs: do away with non-whole_page extent
  I/O") introduced the check first, and in the commit message:

    I've replaced the whole_page computations with warnings, just to be
    sure that we're not issuing partial page reads or writes.  The
    warnings should probably just go away some time.

- No similar check in all other endio functions
  No matter if it's data read, compressed read or write.

- There is no such report for very long
  I do not even remember if there is any such report.

Thus the need to do such check in end_bbio_data_write() is very weak,
and we can just get rid of it.

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

fs/btrfs/extent_io.c

@@ -521,7 +521,6 @@ static void end_bbio_data_write(struct btrfs_bio *bbio)
 	struct bio *bio = &bbio->bio;
 	int error = blk_status_to_errno(bio->bi_status);
 	struct folio_iter fi;
-	const u32 sectorsize = fs_info->sectorsize;
 	u32 bio_size = 0;
 
 	ASSERT(!bio_flagged(bio, BIO_CLONED));
@@ -531,16 +530,6 @@ static void end_bbio_data_write(struct btrfs_bio *bbio)
 		u32 len = fi.length;
 
 		bio_size += len;
-		/* Our read/write should always be sector aligned. */
-		if (!IS_ALIGNED(fi.offset, sectorsize))
-			btrfs_err(fs_info,
-		"partial page write in btrfs with offset %zu and length %zu",
-				  fi.offset, fi.length);
-		else if (!IS_ALIGNED(fi.length, sectorsize))
-			btrfs_info(fs_info,
-		"incomplete page write with offset %zu and length %zu",
-				   fi.offset, fi.length);
-
 		if (error)
 			mapping_set_error(folio->mapping, error);