btrfs: remove duplicated include in block-group.c

disk-io.h is included more than once in block-group.c, remove it.

Reviewed-by: Johannes Thumshirn <[email protected]>
Signed-off-by: Tiezhu Yang <[email protected]>
Signed-off-by: David Sterba <[email protected]>

Author: seehearfeel

fs/btrfs/block-group.c

@@ -7,7 +7,6 @@
 #include "disk-io.h"
 #include "free-space-cache.h"
 #include "free-space-tree.h"
-#include "disk-io.h"
 #include "volumes.h"
 #include "transaction.h"
 #include "ref-verify.h"