Fix bug 73018 "SSL fails on Mac", check in for sfraser. r=pinkerton, sr=sfraser.

nsprpub/pr/src/md/mac/macsockotpt.c

@@ -471,9 +471,9 @@ static pascal void  NotifierRoutine(void * contextPtr, OTEventCode code, OTResul
 
 	if (pollThread)
 		WakeUpNotifiedThread(pollThread, kOTNoError);
-	else
-	WakeUpNotifiedThread(thread, result);
-	
+
+	if (thread && (thread != pollThread))
+		WakeUpNotifiedThread(thread, result);
 }