btrfs: make FS_INFO ioctl available to anyone

This ioctl provides basic info about the filesystem that can be obtained
in other ways (eg. sysfs), there's no reason to restrict it to
CAP_SYSADMIN.
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>

fs/btrfs/ioctl.c

@@ -2557,9 +2557,6 @@ static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
 	struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
 	int ret = 0;
 
-	if (!capable(CAP_SYS_ADMIN))
-		return -EPERM;
-
 	fi_args = kzalloc(sizeof(*fi_args), GFP_KERNEL);
 	if (!fi_args)
 		return -ENOMEM;