Fixed usage of 8-bit modulo operator off-by-one maximum. (#901)

test/bacnet/datalink/cobs/src/main.c

@@ -38,7 +38,7 @@ static void test_COBS_Encode_Decode(void)
     size_t encoded_buffer_length, test_buffer_length;
 
     for (i = 2; i < sizeof(buffer); i++) {
-        buffer[i] = i % 0xff;
+        buffer[i] = i % 256;
     }
     encoded_buffer_length = cobs_frame_encode(
         encoded_buffer, sizeof(encoded_buffer), buffer, sizeof(buffer));