[Bug malloc/17924] 'free' should not set errno

[eggert at cs dot ucla.edu]

https://sourceware.org/bugzilla/show_bug.cgi?id=17924

eggert at cs dot ucla.edu changed:

           What    |Removed                     |Added
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  Attachment #13071|0                           |1
        is obsolete|                            |

--- Comment #7 from eggert at cs dot ucla.edu ---
Created attachment 13072
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13072&action=edit
patch 'free' to preserve errno (take 4)

This reflects comments from Florian Weimer
<https://sourceware.org/pipermail/libc-alpha/2020-December/120911.html> by
improving the test case. Also, it fixes the bug number in the commit message.

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