btrfs: drop unnecessary ret in ioctl_quota_rescan_status

There is no need for the variable ret after d66105cfa873 ("btrfs:
allocate btrfs_ioctl_quota_rescan_args on stack"), remove it.
Signed-off-by: NAnand Jain <anand.jain@oracle.com>
Reviewed-by: NDavid Sterba <dsterba@suse.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>

fs/btrfs/ioctl.c

@@ -4430,7 +4430,6 @@ static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info,
 						void __user *arg)
 {
 	struct btrfs_ioctl_quota_rescan_args qsa = {0};
-	int ret = 0;
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
@@ -4441,9 +4440,9 @@ static long btrfs_ioctl_quota_rescan_status(struct btrfs_fs_info *fs_info,
 	}
 
 	if (copy_to_user(arg, &qsa, sizeof(qsa)))
-		ret = -EFAULT;
+		return -EFAULT;
 
-	return ret;
+	return 0;
 }
 
 static long btrfs_ioctl_quota_rescan_wait(struct btrfs_fs_info *fs_info,