xfs: only call xf{array,blob}_destroy if we have a valid pointer

xfs: only call xf{array,blob}_destroy if we have a valid pointer

Only call the xfarray and xfblob destructor if we have a valid pointer,
and be sure to null out that pointer afterwards.  Note that this patch
fixes a large number of commits, most of which were merged between 6.9
and 6.10.

Cc: r772577952@gmail.com
Cc: <stable@vger.kernel.org> # v6.12
Fixes: ab97f4b1c03075 ("xfs: repair AGI unlinked inode bucket lists")
Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Jiaming Zhang <r772577952@gmail.com>