xfs: fix len comparison in xfs_extent_busy_trim

The length is now passed by reference, so the assertion has to be updated
to match the other changes, as pointed out by this W=1 warning:

fs/xfs/xfs_extent_busy.c: In function 'xfs_extent_busy_trim':
fs/xfs/xfs_extent_busy.c:356:13: error: ordered comparison of pointer with integer zero [-Werror=extra]

Fixes: ebf5587 ("xfs: improve handling of busy extents in the low-level allocator")
Signed-off-by: Arnd Bergmann <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Darrick J. Wong <[email protected]>
Signed-off-by: Darrick J. Wong <[email protected]>

Author: arndb

fs/xfs/xfs_extent_busy.c

@@ -353,7 +353,7 @@ xfs_extent_busy_trim(
 	struct rb_node		*rbp;
 	bool			ret = false;
 
-	ASSERT(len > 0);
+	ASSERT(*len > 0);
 
 	spin_lock(&args->pag->pagb_lock);
 restart: