esp_rom: esp32s2: suppress -Waddress-of-packed-member warning

components/esp_rom/esp32s2/usb_descriptors.c

@@ -49,6 +49,10 @@ void rom_usb_cdc_set_descriptor_patch(void)
     uint8_t mac_bytes[6];
     efuse_hal_get_mac(mac_bytes);
     /* Convert to UTF16 string */
+#pragma GCC diagnostic push
+#if     __GNUC__ >= 9
+#pragma GCC diagnostic ignored "-Waddress-of-packed-member"
+#endif
     uint16_t* dst = s_str_serial_descr.bString;
     for (int i = 0; i < 6; ++i) {
         uint8_t b = mac_bytes[5 - i]; /* printing from the MSB */
@@ -56,6 +60,7 @@ void rom_usb_cdc_set_descriptor_patch(void)
         *dst++ = nibble_to_hex_u16(b & 0xf);
         dst++;
     }
+#pragma GCC diagnostic pop
 
     /* Override the pointer to descriptors structure */
     rom_usb_curr_desc = &s_acm_usb_descriptors_override;