Update language to comply with Android's inclusive language guidance

See https://source.android.com/setup/contribute/respectful-code for reference

 
BUG=161896447

Change-Id: I794af0bef966ec88d7ee6b5f5d66969571f04317
diff --git a/Parcel.cpp b/Parcel.cpp
index 2e477d2..a1af61d 100644
--- a/Parcel.cpp
+++ b/Parcel.cpp
@@ -465,7 +465,7 @@
 
     const size_t padded = pad_size(len);
 
-    // sanity check for integer overflow
+    // validate for integer overflow
     if (mDataPos+padded < mDataPos) {
         return nullptr;
     }