Fix small mistake in client process_options

packet-exchange/src/client.c

@@ -202,7 +202,7 @@ static void help(char *argv[]) {
 static void process_options(int argc, char *argv[], thread_param_t *param,
                             main_param_t *main_param) {
   for (;;) {
-    int c = getopt(argc, argv, "abd:efh:i:l:p:q:r:t");
+    int c = getopt(argc, argv, "abd:ef:hi:l:p:q:r:t");
 
     if (c == -1) break;