add a return NULL to a function that is expected to return a value

so compilers that don't understand that this code is NOTREACHED
will not complain (the fault is not much on the compiler but on the
declaration of pthread_exit on certain platforms)
s/certain platform/cygwin/ if you are really curious



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@89368 65c4cc65-6c06-0410-ace0-fbb531ad65f3

utils/hashtest2.c

@@ -259,6 +259,7 @@ static void *hashtest(void *data)
 	printf("\ntotals..................... lookups=%d/%d, added=%d, removed=%d; traversals=%d\n",
 		   els_found, els_lookedup, els_added, els_removed, els_traversals);
 	pthread_exit(0);
+	return NULL;
 }
 
 static void run_hashtest(int numthr)