smr: Remove the return value from smr_wait()

This is supposed to be a blocking version of smr_poll(), so there's no
need for a return value.  No functional change intended.

MFC after:	1 week

share/man/man9/smr.9

@@ -64,7 +64,7 @@
 .Fo smr_synchronize
 .Fa "smr_t smr"
 .Fc
-.Ft bool
+.Ft void
 .Fo smr_wait
 .Fa "smr_t smr"
 .Fa "smr_seq_t goal"

sys/kern/subr_smr.c

@@ -579,6 +579,7 @@ smr_poll(smr_t smr, smr_seq_t goal, bool wait)
 	 */
 	atomic_thread_fence_acq();
 
+	KASSERT(success || !wait, ("%s: blocking poll failed", __func__));
 	return (success);
 }
 

sys/sys/smr.h

@@ -241,11 +241,11 @@ void smr_destroy(smr_t smr);
 /*
  * Blocking wait for all readers to observe 'goal'.
  */
-static inline bool
+static inline void
 smr_wait(smr_t smr, smr_seq_t goal)
 {
 
-	return (smr_poll(smr, goal, true));
+	(void)smr_poll(smr, goal, true);
 }
 
 /*