xfs: fix a memory leak in xfs_buf_item_init()

xfs: fix a memory leak in xfs_buf_item_init()

commit fc40459de82543b565ebc839dca8f7987f16f62e upstream.

xfs_buf_item_get_format() may allocate memory for bip->bli_formats,
free the memory in the error path.

Fixes: c3d5f0c2fb85 ("xfs: complain if anyone tries to create a too-large buffer log item")
Cc: stable@vger.kernel.org
Signed-off-by: Haoxiang Li <lihaoxiang@isrc.iscas.ac.cn>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>