py: Fix prefix on few sequence helpers, was incorrectly "mp_".
diff --git a/py/sequence.c b/py/sequence.c
index 3d2bbba..91162fc 100644
--- a/py/sequence.c
+++ b/py/sequence.c
@@ -50,7 +50,7 @@
     }
 }
 
-bool m_seq_get_fast_slice_indexes(machine_uint_t len, mp_obj_t slice, machine_uint_t *begin, machine_uint_t *end) {
+bool mp_seq_get_fast_slice_indexes(machine_uint_t len, mp_obj_t slice, machine_uint_t *begin, machine_uint_t *end) {
     machine_int_t start, stop, step;
     mp_obj_slice_get(slice, &start, &stop, &step);
     if (step != 1) {