Ticket #7516 (closed crash bug: fixed)

Description

In 1.8.3p6rc1, @lock/use x=y crashes in switch_find because
@lock doesn't actually take switches, despite the use of /
The patch below appears to fix the problem.

 - Javelin



*** 1.8.3/devel/src/command.c	Sat Dec 29 09:44:58 2007
--- soc3/src/command.c	Sat Dec 29 20:55:17 2007
***************
*** 444,449 ****
--- 444,451 ----
        return 0;
    } else {
      size_t len = strlen(sw);
+     if (!cmd->sw.mask)
+       return 0;
      sw_val = dyn_switch_list;
      while (sw_val->name) {
        if (SW_ISSET(cmd->sw.mask, sw_val->value)