/usr/src/games/tetris/screen.c: In function 'scr_set':
/usr/src/games/tetris/screen.c:216:3: error: null argument where non-null required (argument 1) [-Werror=nonnull]
   putstr(enter_ca_mode);
   ^
/usr/src/games/tetris/screen.c:218:3: error: null argument where non-null required (argument 1) [-Werror=nonnull]
   putstr(cursor_invisible);
   ^
/usr/src/games/tetris/screen.c: In function 'scr_end':
/usr/src/games/tetris/screen.c:243:3: error: null argument where non-null required (argument 1) [-Werror=nonnull]
   putstr(cursor_to_ll);
   ^
/usr/src/games/tetris/screen.c:248:3: error: null argument where non-null required (argument 1) [-Werror=nonnull]
   putstr(exit_ca_mode);
   ^
/usr/src/games/tetris/screen.c:250:3: error: null argument where non-null required (argument 1) [-Werror=nonnull]
   putstr(cursor_normal);
   ^