Fix a leaking "pathname" in import.c
diff --git a/Python/import.c b/Python/import.c
index 529c3c2..3a3c9f2 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -3114,6 +3114,7 @@
 		return NULL;
 	}
 	m = load_source_module(name, pathname, fp);
+	PyMem_Free(pathname);
 	fclose(fp);
 	return m;
 }