Tidy up some C-isms.

Change-Id: I53b457cab9067369320457549071fc3e4c23c81b
diff --git a/src/compiler/codegen/Optimizer.h b/src/compiler/codegen/Optimizer.h
index 06c7732..94b1907 100644
--- a/src/compiler/codegen/Optimizer.h
+++ b/src/compiler/codegen/Optimizer.h
@@ -25,8 +25,7 @@
 struct CompilationUnit;
 struct LIR;
 
-void oatApplyLocalOptimizations(struct CompilationUnit* cUnit,
-                                struct LIR* head, struct LIR* tail);
+void oatApplyLocalOptimizations(CompilationUnit* cUnit, LIR* head, LIR* tail);
 
 }  // namespace art