fix lint warning

Change-Id: I0e39463fcdfd0d39c5dfdb74768e925063e4a1b6
diff --git a/testsharder/shard.go b/testsharder/shard.go
index 64ff3ae..b92f5ff 100644
--- a/testsharder/shard.go
+++ b/testsharder/shard.go
@@ -108,9 +108,8 @@
 func divRoundUp(a, b int) int {
 	if a % b == 0 {
 		return a / b
-	} else {
-		return (a / b) + 1
 	}
+	return (a / b) + 1
 }
 
 // WithMaxSize returns a list of shards such that each shard contains fewer than maxShardSize tests.