py/repl: Initialise q_last variable to prevent compiler warnings.
Some older compilers cannot deduce that q_last is always written to before
being read.
@@ -175,7 +175,7 @@ size_t mp_repl_autocomplete(const char *str, size_t len, const mp_print_t *print
// look for matches
const char *match_str = NULL;
size_t match_len = 0;
- qstr q_first = 0, q_last;
+ qstr q_first = 0, q_last = 0;
for (qstr q = MP_QSTR_ + 1; q < nqstr; ++q) {
size_t d_len;
const char *d_str = (const char*)qstr_data(q, &d_len);
