Change rig.c to utilize caps function

src/rig.c

@@ -1150,7 +1150,7 @@ int HAMLIB_API rig_get_twiddle(RIG *rig, int *seconds)
 // detect if somebody is twiddling the VFO
 // indicator is last set freq doesn't match current freq
 // so we have to query freq every time we set freq or vfo to handle this
-static int twiddling(RIG *rig)
+int twiddling(RIG *rig)
 {
     const struct rig_caps *caps;
 
@@ -1832,9 +1832,11 @@ int HAMLIB_API rig_set_vfo(RIG *rig, vfo_t vfo)
     // we only get the freq if we set the vfo OK
     if (retcode == RIG_OK && caps->get_freq)
     {
-        retcode = rig_get_freq(rig, vfo, &curr_freq);
-        rig_debug(RIG_DEBUG_TRACE, "%s: retcode from rig_get_freq = %s\n", __func__,
+        if (caps->get_freq) {
+            retcode = caps->get_freq(rig, vfo, &curr_freq);
+            rig_debug(RIG_DEBUG_TRACE, "%s: retcode from rig_get_freq = %s\n", __func__,
                   rigerror(retcode));
+	}
     }