benchfmt: clarify parsing error test

Change-Id: I53666612a859f567150deec58614dc448db911e2
Reviewed-on: https://go-review.googlesource.com/c/perf/+/540796
Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Austin Clements <austin@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
diff --git a/benchfmt/reader_test.go b/benchfmt/reader_test.go
index ac6d6cf..74a0711 100644
--- a/benchfmt/reader_test.go
+++ b/benchfmt/reader_test.go
@@ -179,7 +179,7 @@
 		{
 			"bad lines",
 			`not a benchmark
-BenchmarkMissingIter 
+BenchmarkTailingSpaceNoIter 
 BenchmarkBadIter abc
 BenchmarkHugeIter 9999999999999999999999999999999
 BenchmarkMissingVal 100