port-qmi: avoid running install_properties() without properties defined

We'll setup the properties only if QRTR support is being built, otherwise we fully skip all property related setup.

  (ModemManager:480463): GLib-GObject-CRITICAL **: 22:48:14.264: g_object_class_install_properties: assertion 'n_pspecs > 1' failed

  Thread 1 "ModemManager" received signal SIGTRAP, Trace/breakpoint trap.
  0x00007ffff76e3295 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
  (gdb) bt
  #0  0x00007ffff76e3295 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
  #1  0x00007ffff76e4579 in g_logv () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
  #2  0x00007ffff76e4743 in g_log () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
  #3  0x00005555556af70c in mm_port_qmi_class_init (klass=0x5555557fae20) at mm-port-qmi.c:2619
  #4  0x00005555556a94c3 in mm_port_qmi_class_intern_init (klass=0x5555557fae20) at mm-port-qmi.c:34
  #5  0x00007ffff77ed1d1 in g_type_class_ref () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
  #6  0x00007ffff77d05e1 in g_object_new_valist () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
  #7  0x00007ffff77d06cd in g_object_new () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
  #8  0x00005555556af25a in mm_port_qmi_new (name=0x5555557e54e0 "cdc-wdm0", subsys=MM_PORT_SUBSYS_USBMISC) at mm-port-qmi.c:2481
  #9  0x000055555563c8d7 in wdm_probe_qmi (self=0x5555557de1b0) at mm-port-probe.c:517
  #10 0x000055555563cc70 in wdm_probe (self=0x5555557de1b0) at mm-port-probe.c:623
  #11 0x00007ffff76dd04e in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
  #12 0x00007ffff76dd400 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
  #13 0x00007ffff76dd6f3 in g_main_loop_run () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
  #14 0x00005555555b1ae4 in main (argc=1, argv=0x7fffffffe558) at main.c:213

src/mm-port-qmi.c

@@ -33,16 +33,18 @@
 
 G_DEFINE_TYPE (MMPortQmi, mm_port_qmi, MM_TYPE_PORT)
 
+#if defined WITH_QRTR
+
 enum {
     PROP_0,
-#if defined WITH_QRTR
     PROP_NODE,
-#endif
     PROP_LAST
 };
 
 static GParamSpec *properties[PROP_LAST];
 
+#endif
+
 typedef struct {
     QmiService  service;
     QmiClient  *client;
@@ -2511,23 +2513,21 @@ mm_port_qmi_init (MMPortQmi *self)
                                                             NULL);
 }
 
+#if defined WITH_QRTR
+
 static void
 set_property (GObject      *object,
               guint         prop_id,
               const GValue *value,
               GParamSpec   *pspec)
 {
+    MMPortQmi *self = MM_PORT_QMI (object);
+
     switch (prop_id) {
-#if defined WITH_QRTR
     case PROP_NODE:
-    {
-        MMPortQmi *self = MM_PORT_QMI (object);
-
         /* construct only, no new reference! */
         self->priv->node = g_value_get_object (value);
         break;
-    }
-#endif
     default:
         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
         break;
@@ -2540,22 +2540,20 @@ get_property (GObject    *object,
               GValue     *value,
               GParamSpec *pspec)
 {
+    MMPortQmi *self = MM_PORT_QMI (object);
+
     switch (prop_id) {
-#if defined WITH_QRTR
     case PROP_NODE:
-    {
-        MMPortQmi *self = MM_PORT_QMI (object);
-
         g_value_set_object (value, self->priv->node);
         break;
-    }
-#endif
     default:
         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
         break;
     }
 }
 
+#endif /* defined WITH_QRTR */
+
 static void
 dispose (GObject *object)
 {
@@ -2603,11 +2601,12 @@ mm_port_qmi_class_init (MMPortQmiClass *klass)
     g_type_class_add_private (object_class, sizeof (MMPortQmiPrivate));
 
     /* Virtual methods */
-    object_class->get_property = get_property;
-    object_class->set_property = set_property;
     object_class->dispose = dispose;
 
 #if defined WITH_QRTR
+    object_class->get_property = get_property;
+    object_class->set_property = set_property;
+
     properties[PROP_NODE] =
         g_param_spec_object ("node",
                              "Qrtr Node",
@@ -2615,6 +2614,6 @@ mm_port_qmi_class_init (MMPortQmiClass *klass)
                              QRTR_TYPE_NODE,
                              G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);
 
-#endif
     g_object_class_install_properties (object_class, PROP_LAST, properties);
+#endif
 }