btrfs: raid56: fix memory leak of btrfs_raid_bio::stripe_uptodate_bitmap

We allocate the bitmap but we never free it in free_raid_bio_pointers().
Fix this by adding a bitmap_free() call against the stripe_uptodate_bitmap
of a raid bio.

Fixes: 1810350 ("btrfs: raid56: move sector_ptr::uptodate into a dedicated bitmap")
Reported-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/linux-btrfs/20260126045315.GA31641@lst.de/
Reviewed-by: Qu Wenruo <wqu@suse.com>
Tested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

Author: fdmanana

fs/btrfs/raid56.c

@@ -150,6 +150,7 @@ static void scrub_rbio_work_locked(struct work_struct *work);
 static void free_raid_bio_pointers(struct btrfs_raid_bio *rbio)
 {
 	bitmap_free(rbio->error_bitmap);
+	bitmap_free(rbio->stripe_uptodate_bitmap);
 	kfree(rbio->stripe_pages);
 	kfree(rbio->bio_paddrs);
 	kfree(rbio->stripe_paddrs);