libbinder: Don't alloc for RPC_COMMAND_DEC_STRONG

Test: TH
Change-Id: I89eb9d87cd6d306d13b879649d209c6b6abd2494
diff --git a/libs/binder/tests/binderAllocationLimits.cpp b/libs/binder/tests/binderAllocationLimits.cpp
index 2c34766..60b3c94 100644
--- a/libs/binder/tests/binderAllocationLimits.cpp
+++ b/libs/binder/tests/binderAllocationLimits.cpp
@@ -210,8 +210,8 @@
         });
         CHECK_EQ(OK, remoteBinder->pingBinder());
     }
-    EXPECT_EQ(mallocs, 2);
-    EXPECT_EQ(totalBytes, 56);
+    EXPECT_EQ(mallocs, 1);
+    EXPECT_EQ(totalBytes, 40);
 }
 
 int main(int argc, char** argv) {