BREAKING: Change return type of channel() (#7656)

Author: devyte

libraries/ESP8266WiFi/src/ESP8266WiFiGeneric.cpp

@@ -254,7 +254,7 @@ void ESP8266WiFiGenericClass::_eventCallback(void* arg)
  * Return the current channel associated with the network
  * @return channel (1-13)
  */
-int32_t ESP8266WiFiGenericClass::channel(void) {
+uint8_t ESP8266WiFiGenericClass::channel(void) {
     return wifi_get_channel();
 }
 

libraries/ESP8266WiFi/src/ESP8266WiFiGeneric.h

@@ -74,7 +74,7 @@ class ESP8266WiFiGenericClass {
         WiFiEventHandler onSoftAPModeProbeRequestReceived(std::function<void(const WiFiEventSoftAPModeProbeRequestReceived&)>);
         WiFiEventHandler onWiFiModeChange(std::function<void(const WiFiEventModeChange&)>);
 
-        int32_t channel(void);
+        uint8_t channel(void);
 
         bool setSleepMode(WiFiSleepType_t type, uint8_t listenInterval = 0);