Add min_length initialization.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2537 bbd45198-f89e-11dd-88c7-29a3b14d5316

components/finsh/cmd.c

@@ -643,6 +643,7 @@ void list_prefix(char *prefix)
 
     func_cnt = 0;
     var_cnt  = 0;
+	min_length = 0;
     name_ptr = RT_NULL;
 
     /* checks in system function call */