LoRaWAN: Wrong return code for JoinRequest retry

51f92b0 introduced
handling for connection attempts while a connection was already underway or have been
completed. Unfortunately a similar check slipped through and the stack was not able to continue
sending join requests if an error happened.

Author: Hasnain Virk

features/lorawan/lorastack/mac/LoRaMac.cpp

@@ -772,7 +772,7 @@ bool LoRaMac::continue_joining_process()
     }
 
     // Schedule a retry
-    if (handle_retransmission() != LORAWAN_STATUS_OK) {
+    if (handle_retransmission() != LORAWAN_STATUS_CONNECT_IN_PROGRESS) {
         return false;
     }