Btrfs: Remove unnecessary placeholder in btrfs_err_code

From: Satoru Takeuchi <[email protected]>

"notused" is not necessary. Set 1 to the first entry is enough.

---
I once submit the similar patch to btrfs-progs. Then Gui Hecheng tell me fixing original code in kernel is better.

http://permalink.gmane.org/gmane.comp.file-systems.btrfs/41679

---
 include/uapi/linux/btrfs.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

index 611e1c5..b6dec05 100644
@@ -495,8 +495,7 @@ struct btrfs_ioctl_send_args {
 
 /* Error codes as returned by the kernel */
 enum btrfs_err_code {
-	notused,
-	BTRFS_ERROR_DEV_RAID1_MIN_NOT_MET,
+	BTRFS_ERROR_DEV_RAID1_MIN_NOT_MET = 1,
 	BTRFS_ERROR_DEV_RAID10_MIN_NOT_MET,
 	BTRFS_ERROR_DEV_RAID5_MIN_NOT_MET,
 	BTRFS_ERROR_DEV_RAID6_MIN_NOT_MET,

1.8.3.1

The kernel header is exported and the authoritative source for the ioctl definitions, progs usually copy the required portions but should be identical in the end.