btrfs: Fix checkpatch.pl warning of spacing issues

Fix spacing issues detected via checkpatch.pl in accordance with the
kernel style guidelines.

Signed-off-by: Dulshani Gunawardhana <dulshani.gunawardhana89@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 3a20a12..82d0342 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -369,7 +369,7 @@
 	u64 root_objectid = 0;
 
 	atomic_inc(&fs_info->defrag_running);
-	while(1) {
+	while (1) {
 		/* Pause the auto defragger. */
 		if (test_bit(BTRFS_FS_STATE_REMOUNTING,
 			     &fs_info->fs_state))