esp32s2: wifi: fix several debug-build errors

[jepler]

Closes #3688

With this change, I don't get the ESP_ERROR_CHECK failed repeatedly running code that imports wifi. (I'm not getting a successful connection but that's probably my own fault, such as a secrets problem)

[jepler]

Testing performed: In a debug build on kaluga, repeatedly ran a test program which does import wifi:

import ipaddress
import ssl
import wifi
import socketpool
#import adafruit_requests

# URLs to fetch from
TEXT_URL = "http://wifitest.adafruit.com/testwifi/index.html"
JSON_QUOTES_URL = "https://www.adafruit.com/api/quotes.php"
JSON_STARS_URL = "https://api.github.com/repos/adafruit/circuitpython"

# Get wifi details and more from a secrets.py file
try:
    from secrets import secrets
except ImportError:
    print("WiFi secrets are kept in secrets.py, please add them there!")
    raise

print("ESP32-S2 WebClient Test")

print("My MAC addr:", [hex(i) for i in wifi.radio.mac_address])

print("Avaliable WiFi networks:")
for network in wifi.radio.start_scanning_networks():
    print("\t%s\t\tRSSI: %d\tChannel: %d" % (str(network.ssid, "utf-8"),
            network.rssi, network.channel))
wifi.radio.stop_scanning_networks()

print("Connecting to %s"%secrets["ssid"])
wifi.radio.connect(secrets["ssid"], secrets["password"])
#...

There's more code after "..." but for probably unrelated reasons my wifi connection doesn't actually succeed.

[jepler]

With this something else is still wrong with my debug builds -- adding DEBUG=1 to the Make environment AND making the following changes in sdkconfig-debug.defaults:

+CONFIG_BOOTLOADER_COMPILER_OPTIMIZATION_DEBUG=y
+CONFIG_COMPILER_OPTIMIZATION_DEFAULT=y
+CONFIG_COMPILER_OPTIMIZATION_ASSERTIONS_ENABLE=y

... leads to non-working wifi

[tannewt]

So... do you want to merge it or not?

[jepler]

I don't think it's causing the wifi failures I saw with the additional debug flags enabled, so yeah, I'd like to see it merged.

[tannewt]

Ok, thanks!