tests/api.c: in test_wolfSSL_TXT_DB(), fix -Wpointer-to-int-cast detected by building --host=x86_64-w64-mingw32.

Author: douzzer

tests/api.c

@@ -42578,7 +42578,7 @@ static int test_wolfSSL_TXT_DB(void)
 
     /* Test index */
     ExpectIntEQ(TXT_DB_create_index(db, 3, NULL,
-        (wolf_sk_hash_cb)(long unsigned int)TXT_DB_hash,
+        (wolf_sk_hash_cb)(wc_ptr_t)TXT_DB_hash,
         (wolf_lh_compare_cb)TXT_DB_cmp), 1);
     ExpectNotNull(TXT_DB_get_by_index(db, 3, (WOLFSSL_STRING*)fields));
     fields[3] = "12DA";