benchproc: remove unnecessary fmt.Sprintf

Change-Id: I88a67c499ba175b5d34f562d40e0abc2b0e87c4e
GitHub-Last-Rev: 9f031f6288a9b535c5eef93e44c5ff94baa1e936
GitHub-Pull-Request: golang/perf#10
Reviewed-on: https://go-review.googlesource.com/c/perf/+/515835
Reviewed-by: qiu laidongfeng2 <2645477756@qq.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
diff --git a/benchproc/projection.go b/benchproc/projection.go
index 26d934b..149cb7d 100644
--- a/benchproc/projection.go
+++ b/benchproc/projection.go
@@ -188,7 +188,7 @@
 		// specific file keys.
 		if proj.Order == "fixed" {
 			// Fixed orders don't make sense for a whole tuple.
-			return nil, &parse.SyntaxError{q, proj.OrderOff, fmt.Sprintf("fixed order not allowed for .config")}
+			return nil, &parse.SyntaxError{q, proj.OrderOff, "fixed order not allowed for .config"}
 		}
 
 		p.haveConfig = true