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Differential D51717

Fix handling of empty bad memory addresses file
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Authored by romain on Sun, Aug 3, 6:45 PM.
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kib
markj
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rG77a0173ca956: vm_page: Fix handling of empty bad memory addresses file
rGaa326b970e36: vm_page: Fix handling of empty bad memory addresses file
rGf90940ce6eb7: vm_page: Fix handling of empty bad memory addresses file
Summary

After I MFC D51433, Mark Millard raised concerns about this change:
https://lists.freebsd.org/archives/dev-commits-src-branches/2025-August/023040.html

I have limited knowledge of this code, but as I understand it, their concerns apply when the user configure a bad address file and this file exist but is empty (0 lines, 0 bytes). If so, I propose to adjust the code this way to explicitly show what valid pre-conditions put a value in *list / *end, and otherwise both are set to NULL.

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rG FreeBSD src repository
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sys/
vm/
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sys/vm/vm_page.c

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