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()
  ...

gpg-interface.c

@@ -219,11 +219,9 @@ int verify_signed_buffer(const char *payload, size_t payload_size,
 	args_gpg[0] = gpg_program;
 	fd = git_mkstemp(path, PATH_MAX, ".git_vtag_tmpXXXXXX");
 	if (fd < 0)
-		return error(_("could not create temporary file '%s': %s"),
-			     path, strerror(errno));
+		return error_errno(_("could not create temporary file '%s'"), path);
 	if (write_in_full(fd, signature, signature_size) < 0)
-		return error(_("failed writing detached signature to '%s': %s"),
-			     path, strerror(errno));
+		return error_errno(_("failed writing detached signature to '%s'"), path);
 	close(fd);
 
 	gpg.argv = args_gpg;