Fix occurrences of "-Wextra-semi-stmt"

Docs-Preview: https://skia.org/?cl=173761
Change-Id: Iefdb91cd28eabb4b01b7b42a4f300b0b4caf05d9
Reviewed-on: https://skia-review.googlesource.com/c/173761
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/bench/GameBench.cpp b/bench/GameBench.cpp
index ae0cb7e..4d34fc1 100644
--- a/bench/GameBench.cpp
+++ b/bench/GameBench.cpp
@@ -51,7 +51,7 @@
         case kRotate_Type:
             fName.append("_rot");
             break;
-        };
+        }
 
         if (aligned) {
             fName.append("_aligned");