xfs: refactor remote attr value buffer invalidation

xfs: refactor remote attr value buffer invalidation

commit 80e8ef468743b488c4ed6afbe424df6dc81ccc0c upstream.

[Replaced XFS_IS_CORRUPT() calls with ASSERT() for 5.4.y backport]

Hoist the code that invalidates remote extended attribute value buffers
into a separate helper function.  This prepares us for a memory
corruption fix in the next patch.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandan.babu@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>