RTEMS | posix/mmap: Fix validation order for map_fixed addresses (!542)

[shuhua hua (@huangshuhua)]

shuhua hua created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/542

Project:Branches: huangshuhua/rtems:mmap to rtems/rtos/rtems:main
Author:   shuhua hua




Reorder address validation checks to verify NULL pointer before
performing bitwise operations. This prevents potential undefined
behavior when checking page alignment on NULL addresses.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/542
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