Allow passing an ID to journald log driver

The ID has been dropped before this patch, but we can use it to refer a
container ID or anything else identifiable.

Signed-off-by: Sascha Grunert <[email protected]>

src/libcrun/error.c

@@ -236,7 +236,7 @@ libcrun_init_logging (crun_output_handler *new_output_handler, void **new_output
 
         case LOG_TYPE_JOURNALD:
           *new_output_handler = log_write_to_journald;
-          *new_output_handler_arg = NULL;
+          *new_output_handler_arg = (void *) log + strlen ("journald:");
           break;
         }
     }