Add rig_get_freq to rig_open to set up internal status correctly

src/rig.c

@@ -991,6 +991,10 @@ int HAMLIB_API rig_open(RIG *rig)
     }
 
 #endif
+    // read frequence to update internal status
+    freq_t freq;
+    if (caps->get_freq) rig_get_freq(rig, RIG_VFO_A, &freq);
+    if (caps->get_freq) rig_get_freq(rig, RIG_VFO_B, &freq);
     RETURNFUNC(RIG_OK);
 }