libbinder: Fix bad stability set log.

So that it shows current stability as well as new stability.

Bug: 136027762
Test: check log
Change-Id: I7b8481528c0b8e8506a3e95508c9bbef62c71d62
diff --git a/libs/binder/Stability.cpp b/libs/binder/Stability.cpp
index f18bdca..0bcce5b 100644
--- a/libs/binder/Stability.cpp
+++ b/libs/binder/Stability.cpp
@@ -58,7 +58,7 @@
     if (currentStability != Level::UNDECLARED && currentStability != stability) {
         if (log) {
             ALOGE("Interface being set with %s but it is already marked as %s.",
-                stabilityString(stability).c_str(), stabilityString(stability).c_str());
+                stabilityString(stability).c_str(), stabilityString(currentStability).c_str());
         }
         return BAD_TYPE;
     }