xfs: remove duplicated #include

Remove duplicated #include('s) in
  fs/xfs/linux-2.6/xfs_quotaops.c

Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Reviewed-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Alex Elder <aelder@sgi.com>

fs/xfs/linux-2.6/xfs_quotaops.c

@@ -23,7 +23,6 @@
 #include "xfs_ag.h"
 #include "xfs_mount.h"
 #include "xfs_quota.h"
-#include "xfs_log.h"
 #include "xfs_trans.h"
 #include "xfs_bmap_btree.h"
 #include "xfs_inode.h"