Compact aidl exception message

[ Merge of go/wvgerrit/c/cdm/+/167499 ]

Bug: 249941041
Change-Id: I81ce1ecef22bd87c6d879d1ccfd6874e9786f892

libwvdrmengine/src/Utils.cpp

@@ -160,6 +160,7 @@ CryptoSessionApi getCryptoSessionMethodEnum(const std::string& method) {
       jsonMsg["errorMessage"] = msg;
     }
     Json::FastWriter writer;
+    writer.omitEndingLineFeed();
     return ::ndk::ScopedAStatus::fromServiceSpecificErrorWithMessage(
         err, writer.write(jsonMsg).c_str());
   }