[XFS] Fix build failure after enabling CONFIG_XFS_DEBUG

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

fs/xfs/linux-2.6/xfs_buf.c

@@ -886,7 +886,7 @@ int
 xfs_buf_lock_value(
 	xfs_buf_t		*bp)
 {
-	return atomic_read(&bp->b_sema.count);
+	return bp->b_sema.count;
 }
 #endif