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.

To appease clang-format, this patch also includes the following cleanup:

- Fix inconsistency in indentation within V1_0 namespace
- Fix incorrect namespace name in comment

Test: Build
Change-Id: I91208b29aaf8973b412b517cef0675ce623b9acd
diff --git a/base/include/hidl/HidlSupport.h b/base/include/hidl/HidlSupport.h
index d1221fe..5859b6a 100644
--- a/base/include/hidl/HidlSupport.h
+++ b/base/include/hidl/HidlSupport.h
@@ -40,18 +40,22 @@
 namespace hidl {
 namespace memory {
 namespace V1_0 {
-    struct IMemory;
-}; // namespace V1_0
-}; // namespace manager
-}; // namespace hidl
+
+struct IMemory;
+
+}  // namespace V1_0
+}  // namespace memory
+}  // namespace hidl
 
 namespace hidl {
 namespace base {
 namespace V1_0 {
-    struct IBase;
-}; // namespace V1_0
-}; // namespace base
-}; // namespace hidl
+
+struct IBase;
+
+}  // namespace V1_0
+}  // namespace base
+}  // namespace hidl
 
 namespace hardware {