Log failure to load memtrack module only once am: 344ba42d98 am: 22a4769b32 am: b0b959d437

Change-Id: Id3822f50f6d09c0085038da5d919d525d38f637e
diff --git a/memtrack.cpp b/memtrack.cpp
index c5e74c1..3fc24c8 100644
--- a/memtrack.cpp
+++ b/memtrack.cpp
@@ -46,7 +46,9 @@
 //TODO(b/31632518)
 static android::sp<IMemtrack> get_instance() {
     static android::sp<IMemtrack> module = IMemtrack::getService();
-    if (module == nullptr) {
+    static bool logged = false;
+    if (module == nullptr && !logged) {
+        logged = true;
         ALOGE("Couldn't load memtrack module");
     }
     return module;