Merge branch 'nd/error-errno'

The code for warning_errno/die_errno has been refactored and a new
error_errno() reporting helper is introduced.

* nd/error-errno: (41 commits)
  wrapper.c: use warning_errno()
  vcs-svn: use error_errno()
  upload-pack.c: use error_errno()
  unpack-trees.c: use error_errno()
  transport-helper.c: use error_errno()
  sha1_file.c: use {error,die,warning}_errno()
  server-info.c: use error_errno()
  sequencer.c: use error_errno()
  run-command.c: use error_errno()
  rerere.c: use error_errno() and warning_errno()
  reachable.c: use error_errno()
  mailmap.c: use error_errno()
  ident.c: use warning_errno()
  http.c: use error_errno() and warning_errno()
  grep.c: use error_errno()
  gpg-interface.c: use error_errno()
  fast-import.c: use error_errno()
  entry.c: use error_errno()
  editor.c: use error_errno()
  diff-no-index.c: use error_errno()
  ...

builtin/worktree.c

@@ -110,7 +110,7 @@ static void prune_worktrees(void)
 		if (ret < 0 && errno == ENOTDIR)
 			ret = unlink(path.buf);
 		if (ret)
-			error(_("failed to remove: %s"), strerror(errno));
+			error_errno(_("failed to remove '%s'"), path.buf);
 	}
 	closedir(dir);
 	if (!show_only)