ssm: Add API to get device

This can be useful in some cases and it was simply missing.

libfprint/fpi-ssm.c

@@ -617,6 +617,20 @@ fpi_ssm_jump_to_state_delayed (FpiSsm       *machine,
   g_source_set_name (machine->timeout, source_name);
 }
 
+/**
+ * fpi_ssm_get_device:
+ * @machine: an #FpiSsm state machine
+ *
+ * Returns the device that the SSM has been associated with.
+ *
+ * Returns: (transfer none): the #FpDevice.
+ */
+FpDevice*
+fpi_ssm_get_device (FpiSsm *machine)
+{
+  return machine->dev;
+}
+
 /**
  * fpi_ssm_get_cur_state:
  * @machine: an #FpiSsm state machine

libfprint/fpi-ssm.h

@@ -92,6 +92,8 @@ void fpi_ssm_mark_failed (FpiSsm *machine,
 void fpi_ssm_set_data (FpiSsm        *machine,
                        gpointer       ssm_data,
                        GDestroyNotify ssm_data_destroy);
+
+FpDevice * fpi_ssm_get_device (FpiSsm *machine);
 gpointer fpi_ssm_get_data (FpiSsm *machine);
 GError * fpi_ssm_get_error (FpiSsm *machine);
 GError * fpi_ssm_dup_error (FpiSsm *machine);