btrfs: use QSTR() in __btrfs_ioctl_snap_create()

Drop the length argument and use the simpler QSTR().

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/ioctl.c

@@ -1112,7 +1112,7 @@ static noinline int __btrfs_ioctl_snap_create(struct file *file,
 				struct btrfs_qgroup_inherit *inherit)
 {
 	int ret;
-	struct qstr qname = QSTR_INIT(name, strlen(name));
+	struct qstr qname = QSTR(name);
 
 	if (!S_ISDIR(file_inode(file)->i_mode))
 		return -ENOTDIR;