fixing possible buffer overflow in fgetws

sizeof(buf) is 1024, but sizeof(wchar_t) is 4,
so there is just space for sizeof(buf)/sizeof(wchar_t) - 256 chars in buffer.

/*
CC="gcc -D_FORTIFY_SOURCE=2  -O2" make
...
call to ‘__fgetws_chk_warn’ declared with attribute warning: \
fgetws called with bigger size than length of destination buffer
*/

braillefont.c

@@ -52,7 +52,7 @@ int main()
     wchar_t buf[1024];
     setlocale(LC_CTYPE, "");
 
-    while (fgetws(buf, sizeof(buf), stdin))
+    while (fgetws(buf, sizeof(buf)/sizeof(wchar_t), stdin))
     {
         const wchar_t *b;
         for (b=buf; *b; b++)