iface-modem: report last attempt to load_unlock_required implementations

The load_unlock_required() step will be automatically retried by the
generic interface logic unless some specific errors happen (e.g. it
won't be retried if a SIM missing error is received).

This patch allows telling the implementation of the method whether
this time being run is the last one before reporting a hard error or
not.

src/mm-broadband-modem-mbim.c

@@ -1074,6 +1074,7 @@ wait_for_sim_ready (GTask *task)
 
 static void
 modem_load_unlock_required (MMIfaceModem *self,
+                            gboolean last_attempt,
                             GAsyncReadyCallback callback,
                             gpointer user_data)
 {

src/mm-broadband-modem-qmi.c

@@ -1101,6 +1101,7 @@ load_unlock_required_context_step (GTask *task)
 
 static void
 modem_load_unlock_required (MMIfaceModem *self,
+                            gboolean last_attempt,
                             GAsyncReadyCallback callback,
                             gpointer user_data)
 {

src/mm-broadband-modem.c

@@ -1320,6 +1320,7 @@ cpin_query_ready (MMIfaceModem *self,
 
 static void
 modem_load_unlock_required (MMIfaceModem *self,
+                            gboolean last_attempt,
                             GAsyncReadyCallback callback,
                             gpointer user_data)
 {

src/mm-iface-modem.c

@@ -372,6 +372,7 @@ internal_load_unlock_required_context_step (GTask *task)
     g_assert (ctx->pin_check_timeout_id == 0);
     MM_IFACE_MODEM_GET_INTERFACE (self)->load_unlock_required (
         self,
+        (ctx->retries == MAX_RETRIES), /* last_attempt? */
         (GAsyncReadyCallback)load_unlock_required_ready,
         task);
 }

src/mm-iface-modem.h

@@ -120,6 +120,7 @@ struct _MMIfaceModem {
 
     /* Loading of the UnlockRequired property */
     void (*load_unlock_required) (MMIfaceModem *self,
+                                  gboolean last_attempt,
                                   GAsyncReadyCallback callback,
                                   gpointer user_data);
     MMModemLock (*load_unlock_required_finish) (MMIfaceModem *self,