[3.14] gh-134064: Fix sys.remote_exec() error checking (GH-134067) (#134162)

gh-134064: Fix sys.remote_exec() error checking (GH-134067)
(cherry picked from commit 009e7b3698)

Co-authored-by: Victor Stinner <vstinner@python.org>

Python/sysmodule.c

@@ -2484,7 +2484,7 @@ sys_remote_exec_impl(PyObject *module, int pid, PyObject *script)
     PyObject *path;
     const char *debugger_script_path;
 
-    if (PyUnicode_FSConverter(script, &path) < 0) {
+    if (PyUnicode_FSConverter(script, &path) == 0) {
         return NULL;
     }
     debugger_script_path = PyBytes_AS_STRING(path);