patch 8.2.4056: Vim9: memory leak when exporting function in autoload script

Problem:    Vim9: memory leak when exporting function in autoload script.
Solution:   Fee the name if replacing it.
diff --git a/src/scriptfile.c b/src/scriptfile.c
index 7c5da2e..9488666 100644
--- a/src/scriptfile.c
+++ b/src/scriptfile.c
@@ -2210,6 +2210,7 @@
 	    {
 		vim_snprintf((char *)res, len, "%s%s",
 					     si->sn_autoload_prefix, basename);
+		vim_free(name);
 		return res;
 	    }
 	}