btrfs: make DEV_INFO ioctl available to anyone

This ioctl provides basic info about the devices 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

@@ -2593,9 +2593,6 @@ static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
 	int ret = 0;
 	char *s_uuid = NULL;
 
-	if (!capable(CAP_SYS_ADMIN))
-		return -EPERM;
-
 	di_args = memdup_user(arg, sizeof(*di_args));
 	if (IS_ERR(di_args))
 		return PTR_ERR(di_args);