Fix compilation warnings (found with dev-mode)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@138412 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_dahdi.c

@@ -12000,8 +12000,10 @@ retry:
 static int setup_dahdi(int reload);
 static int dahdi_restart(void)
 {
-
-	int i, j, cancel_code;
+#if defined(HAVE_PRI)
+	int i, j;
+#endif
+	int cancel_code;
 	struct dahdi_pvt *p;
 
 	ast_mutex_lock(&restart_lock);