nilfs2: remove loops of single statement macros

This fixes checkpatch.pl warning "WARNING: Single statement macros
should not use a do {} while (0) loop".

Link: http://lkml.kernel.org/r/1462886671-3521-7-git-send-email-konishi.ryusuke@lab.ntt.co.jp
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/nilfs2/the_nilfs.h

@@ -222,15 +222,14 @@ THE_NILFS_FNS(SB_DIRTY, sb_dirty)
  * Mount option operations
  */
 #define nilfs_clear_opt(nilfs, opt)  \
-	do { (nilfs)->ns_mount_opt &= ~NILFS_MOUNT_##opt; } while (0)
+	((nilfs)->ns_mount_opt &= ~NILFS_MOUNT_##opt)
 #define nilfs_set_opt(nilfs, opt)  \
-	do { (nilfs)->ns_mount_opt |= NILFS_MOUNT_##opt; } while (0)
+	((nilfs)->ns_mount_opt |= NILFS_MOUNT_##opt)
 #define nilfs_test_opt(nilfs, opt) ((nilfs)->ns_mount_opt & NILFS_MOUNT_##opt)
 #define nilfs_write_opt(nilfs, mask, opt)				\
-	do { (nilfs)->ns_mount_opt =					\
+	((nilfs)->ns_mount_opt =					\
 		(((nilfs)->ns_mount_opt & ~NILFS_MOUNT_##mask) |	\
-		 NILFS_MOUNT_##opt);					\
-	} while (0)
+		 NILFS_MOUNT_##opt))					\
 
 /**
  * struct nilfs_root - nilfs root object