Fix build.

runtime/bin/main.cc

Index: runtime/bin/main.cc
diff --git a/runtime/bin/main.cc b/runtime/bin/main.cc
index 61a64c6ca48f4e72d6503666c1663a16b509194a..1e3d8479388a0adc590117e74ac35d70d6f54bdb 100644
--- a/runtime/bin/main.cc
+++ b/runtime/bin/main.cc
@@ -1688,7 +1688,7 @@ bool RunMainIsolate(const char* script_name,
       // Keep handling messages until the last active receive port is closed.
       result = Dart_RunLoop();
       // Generate an app snapshot after execution if specified.
-      if ((gen_snapshot_kind == kAppJIT)) {
+      if (gen_snapshot_kind == kAppJIT) {
         if (!Dart_IsCompilationError(result) &&
             !Dart_IsVMRestartRequest(result)) {
           GenerateAppSnapshot();