xfs: handle racing deletions in xfs_zone_gc_iter_irec

xfs: handle racing deletions in xfs_zone_gc_iter_irec

Under heavy garbage collection pressure from RocksDB workloads,
filesystem shutdowns can occur in xfs_zone_gc_iter_irec when
xfs_iget() returns -EINVAL for deleted files.

Fix this by handling -EINVAL just like we handle -ENOENT, allowing
zone GC to safely ignore stale mappings.

Fixes: 080d01c41d44 ("xfs: implement zoned garbage collection")
Signed-off-by: Hans Holmberg <hans.holmberg@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Carlos Maiolino <cem@kernel.org>