fix typo

Bug: None
Test: manual
Change-Id: Ib330a94b4d309b86a4c93225ed051d0b04e87ae0
diff --git a/tools/perf/benchmarks b/tools/perf/benchmarks
index 228c1d0..8cb26c8 100755
--- a/tools/perf/benchmarks
+++ b/tools/perf/benchmarks
@@ -573,7 +573,7 @@
 
         # --dist-one requires that only one benchmark be supplied
         if self._args.dist_one and len(self.Benchmarks()) != 1:
-            self._error("--dist-one requires that exactly one --benchmark.")
+            self._error("--dist-one requires exactly one --benchmark.")
 
         if self._had_error:
             raise FatalError()