client/server: fixup "All clients" reporting

We didn't properly account for no group_reporting and multiple
jobs on multiple connections.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/init.c b/init.c
index 23be863..a682423 100644
--- a/init.c
+++ b/init.c
@@ -317,6 +317,10 @@
 	profile_add_hooks(td);
 
 	td->thread_number = thread_number;
+
+	if (!parent || !parent->o.group_reporting)
+		stat_number++;
+
 	return td;
 }