In cel_odbc, an uninitialized RWLIST is attempted to be locked.

Added INIT and DESTROY for the RWLIST odbc_tables

(closes issue #19331)
Reported by: kobaz
Patches: 
      odbc_cel.patch uploaded by kobaz (license 834)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@319812 65c4cc65-6c06-0410-ace0-fbb531ad65f3

cel/cel_odbc.c

@@ -751,11 +751,15 @@ static int unload_module(void)
 
 	free_config();
 	AST_RWLIST_UNLOCK(&odbc_tables);
+	AST_RWLIST_HEAD_DESTROY(&odbc_tables);
+        
 	return 0;
 }
 
 static int load_module(void)
 {
+	AST_RWLIST_HEAD_INIT(&odbc_tables);
+
 	if (AST_RWLIST_WRLOCK(&odbc_tables)) {
 		ast_log(LOG_ERROR, "Unable to lock column list.  Load failed.\n");
 		return 0;