py: Rename MP_QSTR_NULL to MP_QSTRnull to avoid intern collisions.

Fixes #5140.

1 files changed, 1 insertions, 1 deletions

diff --git a/py/repl.c b/py/repl.c
index da0fefb3a..9389b3424 100644
--- a/py/repl.c
+++ b/py/repl.c
@@ -159,7 +159,7 @@ size_t mp_repl_autocomplete(const char *str, size_t len, const mp_print_t *print
         if (str < top) {
             // a complete word, lookup in current object
             qstr q = qstr_find_strn(s_start, s_len);
-            if (q == MP_QSTR_NULL) {
+            if (q == MP_QSTRnull) {
                 // lookup will fail
                 return 0;
             }