libxfs: fix xfs_extent_busy_flush macro definition

xfs_extent_busy_flush is a void function, so don't reduce it to zero.
This shuts up gcc warnings about do-nothing statements.

[sandeen: switch to more common ((void)0) paradigm]

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>

1 file changed