cleanups spotted by irix cc

kern/posix.c

@@ -126,6 +126,7 @@ tramp(void *vp)
 	/* BUG: leaks Proc */
 	pthread_setspecific(prdakey, 0);
 	pthread_exit(0);
+	return 0;
 }
 
 void
@@ -161,20 +162,32 @@ int randfd;
 void
 randominit(void)
 {
+#ifdef USE_RANDOM
+	srandom(getpid()+fastticks(nil)+ticks());
+#else
 	if((randfd = open("/dev/urandom", OREAD)) < 0)
 	if((randfd = open("/dev/random", OREAD)) < 0)
 		panic("open /dev/random: %r");
+#endif
 }
 
 #undef read
 ulong
 randomread(void *v, ulong n)
 {
+#ifdef USE_RANDOM
+	int i;
+
+	for(i=0; i<n; i++)
+		((uchar*)v)[i] = random();
+	return n;
+#else
 	int m;
 
 	if((m = read(randfd, v, n)) != n)
 		panic("short read from /dev/random: %d but %d", n, m);
 	return m;
+#endif
 }
 
 #undef time