runtime verification fix for 7.3:

- Use .old instead of .bak for rvgen kunit backup files
 
   The rvgen kunit command generates .bak backup files and these are
   checked in for selftests as "golden" files for make check. Clean
   make disclean removes such files, leaving the tree dirty.
   Switch to .old to preserve a clean tree after make disclean.
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Merge tag 'trace-rv-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull runtime verification fix from Steven Rostedt:

 - Use .old instead of .bak for rvgen kunit backup files

   The rvgen kunit command generates .bak backup files and these are
   checked in for selftests as "golden" files for make check. But
   'make distclean' removes such files, leaving the tree dirty.

   Switch to .old to preserve a clean tree after make disclean.

* tag 'trace-rv-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  verification/rvgen: Use .old instead of .bak for kunit backup files

tools/verification/rvgen/rvgen/kunit.py

@@ -173,7 +173,7 @@ EXPORT_SYMBOL_IF_KUNIT({struct_name});
             for path in (header_file_path, kunit_c_file_path):
                 if path.exists():
                     try:
-                        path.rename(path.with_suffix(path.suffix + ".bak"))
+                        path.rename(path.with_suffix(path.suffix + ".old"))
                     except OSError as e:
                         raise KUnitError(f"Error backing up file {path}: {e}") from e