Merge branch 'jk/misc-fixes-maint'

* jk/misc-fixes-maint:
  apply: avoid possible bogus pointer
  fix memory leak parsing core.commentchar
  transport: fix leaks in refs_from_alternate_cb
  free ref string returned by dwim_ref
  receive-pack: don't copy "dir" parameter

builtin/show-branch.c

@@ -777,6 +777,7 @@ int cmd_show_branch(int ac, const char **av, const char *prefix)
 			sprintf(nth_desc, "%s@{%d}", *av, base+i);
 			append_ref(nth_desc, sha1, 1);
 		}
+		free(ref);
 	}
 	else if (all_heads + all_remotes)
 		snarf_refs(all_heads, all_remotes);