Merge branch 'bc/prune-info' into maint

"git prune" without "-v" used to warn about leftover temporary
files (which is an indication of an earlier aborted operation).

* bc/prune-info:
  prune.c: only print informational message in show_only or verbose mode

builtin/prune.c

@@ -25,6 +25,7 @@ static int prune_tmp_object(const char *path, const char *filename)
 		return error("Could not stat '%s'", fullpath);
 	if (st.st_mtime > expire)
 		return 0;
+	if (show_only || verbose)
 		printf("Removing stale temporary file %s\n", fullpath);
 	if (!show_only)
 		unlink_or_warn(fullpath);