Clean Up Warnings in Android Glue Code

(This is a merge of go/wvgerrit/24739)

This cleans up some warnings in the Android glue code:

1) Checking if unsigned values are >= 0.
2) Using {0} initializer syntax instead of fully expanding to {0,0}.

Bug: 34394125
Test: Verified compilation passes
Change-Id: Id59730b97da7fce320f634451a44a4df4bf0b494

libwvdrmengine/mediacrypto/src_hidl/WVCryptoPlugin.cpp

@@ -313,18 +313,7 @@ Return<void> WVCryptoPlugin::decrypt(
     }
   }
 
-  uint32_t status;
-  uint32_t bytesWritten;
-
-  if (bufferOffset >= 0) {
-    status = android::OK;
-    bytesWritten = bufferOffset;
-  } else {
-    status = bufferOffset;
-    bytesWritten = 0;
-  }
-
-  _hidl_cb(toStatus(status), bytesWritten, errorDetailMsg.c_str());
+  _hidl_cb(Status::OK, bufferOffset, errorDetailMsg.c_str());
   return Void();
 }