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()
  ...

credential-cache--daemon.c

@@ -179,12 +179,12 @@ static int serve_cache_loop(int fd)
 
 		client = accept(fd, NULL, NULL);
 		if (client < 0) {
-			warning("accept failed: %s", strerror(errno));
+			warning_errno("accept failed");
 			return 1;
 		}
 		client2 = dup(client);
 		if (client2 < 0) {
-			warning("dup failed: %s", strerror(errno));
+			warning_errno("dup failed");
 			close(client);
 			return 1;
 		}