fix crash with ErrorInfoImpl due to missing symbols

coreapi/linphonecore_jni.cc

@@ -7445,6 +7445,24 @@ JNIEXPORT jstring JNICALL Java_org_linphone_core_ErrorInfoImpl_getDetails(JNIEnv
 	return tmp ? env->NewStringUTF(tmp) : NULL;
 }
 
+/*
+ * Class:     org_linphone_core_ErrorInfoImpl
+ * Method:    ref
+ * Signature: (J);
+ */
+JNIEXPORT void JNICALL Java_org_linphone_core_ErrorInfoImpl_ref(JNIEnv *env, jobject jobj, jlong ei){
+	linphone_error_info_ref((LinphoneErrorInfo*)ei);
+}
+
+/*
+ * Class:     org_linphone_core_ErrorInfoImpl
+ * Method:    unref
+ * Signature: (J);
+ */
+JNIEXPORT void JNICALL Java_org_linphone_core_ErrorInfoImpl_unref(JNIEnv *env, jobject jobj, jlong ei){
+	linphone_error_info_unref((LinphoneErrorInfo*)ei);
+}
+
 #ifdef __cplusplus
 }
 #endif

java/impl/org/linphone/core/ErrorInfoImpl.java

@@ -98,5 +98,10 @@ public class ErrorInfoImpl implements ErrorInfo {
 		return getWarnings();
 	}
 
-	
+	protected void finalize() throws Throwable {
+		if (mNativePtr != 0){
+			unref(mNativePtr);
+			mNativePtr = 0;
+		}
+	}
 }