- The recent change to linklists.h broke the build on linux for some reason.

So, I have removed all of the uses of AST_LIST_HEAD_INIT and replaced them
   with the equivalent static initializations.
 - On passing, fix a memory leak in the unload_module() function of chan_agent.
   The agents list mutex was never destroyed, and the elements in the agents
   list were not freed.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@26990 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/linkedlists.h

@@ -353,20 +353,6 @@ struct {								\
  */
 #define AST_LIST_TRAVERSE_SAFE_END  }
 
-/*!
-  \brief Initializes a list head structure.
-  \param head This is a pointer to the list head structure
-
-  This macro initializes a list head structure by setting the head
-  entry to \a NULL (empty list) and recreating the embedded lock.
-*/
-#define AST_LIST_HEAD_INIT(head) {					\
-	(head)->first = NULL;						\
-	(head)->last = NULL;						\
-	(head)->lock = AST_MUTEX_INIT_VALUE;				\
-	ast_mutex_init(&(head)->lock);					\
-}
-
 /*!
   \brief Destroys a list head structure.
   \param head This is a pointer to the list head structure