remove unused var

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@12527 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/esl/src/esl_oop.cpp

@@ -296,8 +296,6 @@ const char *ESLevent::firstHeader(void)
 
 const char *ESLevent::serialize(const char *format)
 {
-	int isxml = 0;
-
 	this_check("");
 
 	esl_safe_free(serialized_string);