xep-0308: Make /correct work without quotation marks

Now we can specify an unlimited amount of arguments for commands.
Maybe this is also helpful for other commands that use quotation marks
so far.

src/tools/parser.c

@@ -48,7 +48,7 @@
  *
  * inp - The line of input
  * min - The minimum allowed number of arguments
- * max - The maximum allowed number of arguments
+ * max - The maximum allowed number of arguments, -1 for infinite
  *
  * Returns - An NULL terminated array of strings representing the arguments
  * of the command, or NULL if the validation fails.
@@ -135,7 +135,7 @@ parse_args(const char *const inp, int min, int max, gboolean *result)
     int num = g_slist_length(tokens) - 1;
 
     // if num args not valid return NULL
-    if ((num < min) || (num > max)) {
+    if ((num < min) || ((max != -1) && (num > max))) {
         g_slist_free_full(tokens, free);
         g_free(copy);
         *result = FALSE;