lib/sort: remove unused pr_fmt macro

lib/sort: remove unused pr_fmt macro

Patch series "lib/sort: Optimizations and cleanups".

This patch series optimizes the handling of the last 2 or 3 elements in
lib/sort and adds a testcase in lib/test_sort to maintain 100% code
coverage reflecting this change.  Additionally, it corrects outdated
descriptions regarding glibc qsort() and removes the unused pr_fmt macro.

This patch (of 4):

The pr_fmt macro is defined but not used in lib/sort.c.  Since there are
no pr_* functions printing any messages, the pr_fmt macro is redundant and
can be safely removed.

Link: https://lkml.kernel.org/r/20240527203011.1644280-1-visitorckw@gmail.com
Link: https://lkml.kernel.org/r/20240527203011.1644280-2-visitorckw@gmail.com
Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Cc: Ching-Chun (Jim) Huang <jserv@ccns.ncku.edu.tw>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>