fix rename failed when rewrite public keys (#7761) (#7769)

models/ssh_key.go

@@ -642,12 +642,14 @@ func rewriteAllPublicKeys(e Engine) error {
 			}
 			_, err = t.WriteString(line + "\n")
 			if err != nil {
+				f.Close()
 				return err
 			}
 		}
-		defer f.Close()
+		f.Close()
 	}
 
+	t.Close()
 	return os.Rename(tmpPath, fPath)
 }