Cleanup error messages from HidlInstrumentor.

Test: compiles
Change-Id: I686815d9e0f2da3057d8b31e54d0f7d37cab3e11
diff --git a/HidlSupport.cpp b/HidlSupport.cpp
index 769db74..a2ada46 100644
--- a/HidlSupport.cpp
+++ b/HidlSupport.cpp
@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+#define LOG_TAG "HidlSupport"
+
 #include <hidl/HidlSupport.h>
 
 #ifdef LIBHIDL_TARGET_DEBUGGABLE
@@ -198,7 +200,7 @@
     for (auto path : instrumentationLibPaths) {
         DIR *dir = opendir(path.c_str());
         if (dir == 0) {
-            LOG(WARNING) << path << " does not exit. ";
+            LOG(WARNING) << path << " does not exist. ";
             return;
         }