Fix lpconfig in java

java/impl/org/linphone/core/LpConfigImpl.java

@@ -23,6 +23,7 @@ package org.linphone.core;
 class LpConfigImpl implements LpConfig {
 
 	private final long nativePtr;
+	boolean ownPtr = false;
 	
 	public LpConfigImpl(long ptr) {
 		nativePtr=ptr;
@@ -32,9 +33,12 @@ class LpConfigImpl implements LpConfig {
 	private native void delete(long ptr);
 	public LpConfigImpl(String file) {
 		nativePtr = newLpConfigImpl(file);
+		ownPtr = true;
 	}
 	protected void finalize() throws Throwable {
-		delete(nativePtr);
+		if(ownPtr) {
+			delete(nativePtr);
+		}
 	}
 
 	private native void setInt(long ptr, String section, String key, int value);