Use *_data_pointer() to get pointer to "state"

Increases function coverage of functions and makes the bindings
more future-proof.

Author: dforsi

bindings/amplifier.swg

@@ -72,7 +72,7 @@ typedef struct Amp {
 		}
 		/* install shortcuts */
 		r->caps = r->amp->caps;
-		r->state = &r->amp->state;
+		r->state = amp_data_pointer(r->amp, RIG_PTRX_AMPSTATE);
 		r->do_exception = 0;    /* default is disabled */
 		r->error_status = RIG_OK;
 		return r;

bindings/rig.swg

@@ -485,7 +485,7 @@ int *rig_spectrum_cb_python(RIG *rig, struct rig_spectrum_line *rig_spectrum_lin
 #endif
 		/* install shortcuts */
 		r->caps = r->rig->caps;
-		r->state = &r->rig->state;
+		r->state = rig_data_pointer(r->rig, RIG_PTRX_STATE);
 		r->do_exception = 0;	/* default is disabled */
 		r->error_status = RIG_OK;
 

bindings/rotator.swg

@@ -68,7 +68,7 @@ typedef struct Rot {
 		}
 		/* install shortcuts */
 		r->caps = r->rot->caps;
-		r->state = &r->rot->state;
+		r->state = &r->rot->state; rot_data_pointer(r->rot, RIG_PTRX_ROTSTATE);
 		r->do_exception = 0;    /* default is disabled */
 		r->error_status = RIG_OK;
 		return r;