Fixing cpplint readability/casting issues

Change-Id: I6821da0e23737995a9b884a04e9b63fac640cd05
diff --git a/runtime/common_test.h b/runtime/common_test.h
index 778ca63..03a45aa 100644
--- a/runtime/common_test.h
+++ b/runtime/common_test.h
@@ -508,7 +508,8 @@
   void ReserveImageSpace() {
     // Reserve where the image will be loaded up front so that other parts of test set up don't
     // accidentally end up colliding with the fixed memory address when we need to load the image.
-    image_reservation_.reset(MemMap::MapAnonymous("image reservation", (byte*)ART_BASE_ADDRESS,
+    image_reservation_.reset(MemMap::MapAnonymous("image reservation",
+                                                  reinterpret_cast<byte*>(ART_BASE_ADDRESS),
                                                   (size_t)100 * 1024 * 1024,  // 100MB
                                                   PROT_NONE));
   }