Remove extra semicolon at end of namespace

Upcoming clang update to r328903 adds a new warning:
  warning: extra ';' outside of a function is incompatible with C++98
  [-Wc++98-compat-extra-semi]

which is included in -Weverything.

We can just delete the extra semicolon (even though we use gnu99), and
save the extra byte.

Test: Build

Change-Id: I49b6e6af483e011632e6a34c0663c93e5c385aa6
diff --git a/libutils/include/utils/TypeHelpers.h b/libutils/include/utils/TypeHelpers.h
index 28fbca5..1554f52 100644
--- a/libutils/include/utils/TypeHelpers.h
+++ b/libutils/include/utils/TypeHelpers.h
@@ -329,7 +329,7 @@
     return hash_type(uintptr_t(value));
 }
 
-}; // namespace android
+}  // namespace android
 
 // ---------------------------------------------------------------------------