scripts/kallsyms: make find_token() return (unsigned char *)

The callers of this function expect (unsigned char *). I do not see
a good reason to make this function return (void *).
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

scripts/kallsyms.c

@@ -503,7 +503,8 @@ static void build_initial_tok_table(void)
 		learn_symbol(table[i].sym, table[i].len);
 }
 
-static void *find_token(unsigned char *str, int len, unsigned char *token)
+static unsigned char *find_token(unsigned char *str, int len,
+				 unsigned char *token)
 {
 	int i;