error: variable 'wchar_ptr' set but not used

```
0$ make
gcc -c -o bscanf.o bscanf.c -g -I. -std=c89 -pedantic -Wall -Werror
bscanf.c:36:12: error: variable 'wchar_ptr' set but not used [-Werror,-Wunused-but-set-variable]
  wchar_t *wchar_ptr;
           ^
1 error generated.
make: *** [bscanf.o] Error 1
2$
```