config: Fix CB_ADD_LEN() to work as originally intended.

Fix a long standing bug in CB_ADD_LEN() behaving like CB_ADD().

ASTERISK-23546 #close
Reported by: Walter Doekes
........

Merged revisions 411960 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@411961 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/config.c

@@ -124,8 +124,10 @@ static void  CB_ADD(struct ast_str **cb, const char *str)
 static void  CB_ADD_LEN(struct ast_str **cb, const char *str, int len)
 {
 	char *s = ast_alloca(len + 1);
-	ast_copy_string(s, str, len);
-	ast_str_append(cb, 0, "%s", str);
+
+	memcpy(s, str, len);
+	s[len] = '\0';
+	ast_str_append(cb, 0, "%s", s);
 }
 
 static void CB_RESET(struct ast_str *cb, struct ast_str *llb)
@@ -1785,7 +1787,7 @@ static struct ast_config *config_text_file_load(const char *database, const char
 					} else if ((comment_p >= new_buf + 2) &&
 						   (*(comment_p - 1) == COMMENT_TAG) &&
 						   (*(comment_p - 2) == COMMENT_TAG)) {
-						/* Meta-Comment end detected */
+						/* Meta-Comment end detected "--;" */
 						comment--;
 						new_buf = comment_p + 1;
 						if (!comment) {