Merge branch 'maint'

* maint:
  annotate: make it work from subdirectories.
  git-config: Correct asciidoc documentation for --int/--bool
  t1300: Add tests for git-config --bool --get
  unpack-trees.c: verify_uptodate: remove dead code
  Use PATH_MAX instead of TEMPFILE_PATH_LEN
  branch: fix segfault when resolving an invalid HEAD

builtin-branch.c

@@ -623,9 +623,10 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
 	    (rename && force_create))
 		usage(builtin_branch_usage);
 
-	head = xstrdup(resolve_ref("HEAD", head_sha1, 0, NULL));
+	head = resolve_ref("HEAD", head_sha1, 0, NULL);
 	if (!head)
 		die("Failed to resolve HEAD as a valid ref.");
+	head = xstrdup(head);
 	if (!strcmp(head, "HEAD")) {
 		detached = 1;
 	}