statsd: fix rendering for groups with idx==0

while skipping `0` might be visually pleasant for non-repeating groups, e.g.:
    bsc.assignment.completed

it makes metrics parsing very awkward for repeating groups, e.g.:
    bts.chreq.total
    bts.1.chreq.total
    bts.2.chreq.total

and since nobody's going to look at raw statsd stream anyway,
we can live with some extra zeroes

Change-Id: Id294202fbcebe0b6b155c7f267b2da73af20adf4
diff --git a/src/stats_statsd.c b/src/stats_statsd.c
index c3f739e..d449667 100644
--- a/src/stats_statsd.c
+++ b/src/stats_statsd.c
@@ -99,24 +99,16 @@
 	int old_len = msgb_length(srep->buffer);
 
 	if (prefix) {
-		if (name1) {
-			if (index1 != 0)
-				fmt = "%1$s.%2$s.%6$u.%3$s:%4$d|%5$s";
-			else
-				fmt = "%1$s.%2$s.%3$s:%4$d|%5$s";
-		} else {
+		if (name1)
+			fmt = "%1$s.%2$s.%6$u.%3$s:%4$d|%5$s";
+		else
 			fmt = "%1$s.%2$0.0s%3$s:%4$d|%5$s";
-		}
 	} else {
 		prefix = "";
-		if (name1) {
-			if (index1 != 0)
-				fmt = "%1$s%2$s.%6$u.%3$s:%4$d|%5$s";
-			else
-				fmt = "%1$s%2$s.%3$s:%4$d|%5$s";
-		} else {
+		if (name1)
+			fmt = "%1$s%2$s.%6$u.%3$s:%4$d|%5$s";
+		else
 			fmt = "%1$s%2$0.0s%3$s:%4$d|%5$s";
-		}
 	}
 
 	if (srep->agg_enabled) {