remove unnecessary struct tags

tictactoe_game.h

@@ -3,7 +3,7 @@
 
 #include <linux/types.h>
 
-typedef struct tictactoe_game {
+typedef struct {
 	char next_turn;
 	char winner;
 	char board[3][3];

tictactoe_internal.h

@@ -10,7 +10,7 @@
 #define tictactoe_error(format, ...) \
 	pr_err("%s: " format, __func__, ##__VA_ARGS__)
 
-typedef struct annotated_string {
+typedef struct {
 	struct mutex lock;
 	size_t len;
 	char *buf;