fsm: convenience: add inline osmo_fsm_inst_state_name()

Change-Id: If9a6ecc4d6e2beaf716569e9a6053d73488e860b
diff --git a/include/osmocom/core/fsm.h b/include/osmocom/core/fsm.h
index 952f82f..3a1f233 100644
--- a/include/osmocom/core/fsm.h
+++ b/include/osmocom/core/fsm.h
@@ -152,6 +152,10 @@
 const char *osmo_fsm_inst_name(struct osmo_fsm_inst *fi);
 const char *osmo_fsm_state_name(struct osmo_fsm *fsm, uint32_t state);
 
+/*! \brief return the name of the state the FSM instance is currently in. */
+static inline const char *osmo_fsm_inst_state_name(struct osmo_fsm_inst *fi)
+{ return osmo_fsm_state_name(fi->fsm, fi->state); }
+
 /*! \brief perform a state change of the given FSM instance
  *
  *  This is a macro that calls _osmo_fsm_inst_state_chg() with the given