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()
  ...

unpack-trees.c

@@ -1533,8 +1533,7 @@ static int verify_absent_1(const struct cache_entry *ce,
 
 		path = xmemdupz(ce->name, len);
 		if (lstat(path, &st))
-			ret = error("cannot stat '%s': %s", path,
-					strerror(errno));
+			ret = error_errno("cannot stat '%s'", path);
 		else
 			ret = check_ok_to_remove(path, len, DT_UNKNOWN, NULL,
 						 &st, error_type, o);
@@ -1542,8 +1541,7 @@ static int verify_absent_1(const struct cache_entry *ce,
 		return ret;
 	} else if (lstat(ce->name, &st)) {
 		if (errno != ENOENT)
-			return error("cannot stat '%s': %s", ce->name,
-				     strerror(errno));
+			return error_errno("cannot stat '%s'", ce->name);
 		return 0;
 	} else {
 		return check_ok_to_remove(ce->name, ce_namelen(ce),