RTEMS | cpukit/shell Fix NULL Pointer Dereference in Shell Memory Dump Commands (!508)

[lei huang (@leihuang)]

lei huang created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/508

Project:Branches: leihuang/rtems:leihuang-main-patch-50573 to rtems/rtos/rtems:main
Author:   lei huang




### Problem Description

The shell memory dump commands (`mdump`, `wdump`, `ldump`) in `cpukit/libmisc/shell/main_mdump.c` have a bug  when invoked without arguments.

**Root Cause:**
When these commands are called without providing a memory address argument (e.g., just typing `wdump`), the `args_parse()` function sets the address pointer to `NULL`. Subsequently, `rtems_mdump()` attempts to dereference this NULL pointer, leading to undefined behavior and potential system crash.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/508
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