mdev: add a comment. no code changes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

util-linux/mdev.c

@@ -565,10 +565,14 @@ static void make_device(char *path, int delete)
 				chown(node_name, rule->ugid.uid, rule->ugid.gid);
 			}
 			if (ENABLE_FEATURE_MDEV_RENAME && alias) {
-				if (aliaslink == '>')
+				if (aliaslink == '>') {
+//TODO: on devtmpfs, device_name already exists and symlink() fails.
+//End result is that instead of symlink, we have two nodes.
+//What should be done?
 					symlink(node_name, device_name);
 				}
 			}
+		}
 
 		if (ENABLE_FEATURE_MDEV_EXEC && command) {
 			/* setenv will leak memory, use putenv/unsetenv/free */