Required for clang

samples/socketio_connect/main.c

@@ -41,7 +41,7 @@ static void on_io_error(void* context)
     (void)printf("IO reported an error\r\n");
 }
 
-int main(int argc, void** argv)
+int main(int argc, char** argv)
 {
     int result;
 

samples/tlsio_connect/main.c

@@ -41,7 +41,7 @@ static void on_io_error(void* context)
     (void)printf("IO reported an error\r\n");
 }
 
-int main(int argc, void** argv)
+int main(int argc, char** argv)
 {
     int result;