py/qstr: Rewrite find_qstr to make manifest that it returns a valid ptr.
So long as the input qstr identifier is valid (below the maximum number of
qstrs) the function will always return a valid pointer.  This patch
eliminates the "return 0" dead-code.
@@ -127,14 +127,12 @@ void qstr_init(void) {
STATIC const byte *find_qstr(qstr q) {
// search pool for this qstr
- for (qstr_pool_t *pool = MP_STATE_VM(last_pool); pool != NULL; pool = pool->prev) {
- if (q >= pool->total_prev_len) {
- return pool->qstrs[q - pool->total_prev_len];
- }
+ // total_prev_len==0 in the final pool, so the loop will always terminate
+ qstr_pool_t *pool = MP_STATE_VM(last_pool);
+ while (q < pool->total_prev_len) {
+ pool = pool->prev;
}
-
- // not found
- return 0;
+ return pool->qstrs[q - pool->total_prev_len];
}
// qstr_mutex must be taken while in this function
