Update lib.pyx

Revised to use intp_t for max_len in maybe_indices_to_slice.  As per conversation with WillAyd revised patch as intp_t is the proper size for an indexer.

Author: benjamindonnachie

pandas/_libs/lib.pyx

@@ -494,10 +494,10 @@ def has_only_ints_or_nan(const floating[:] arr) -> bool:
     return True
 
 
-def maybe_indices_to_slice(ndarray[intp_t, ndim=1] indices, uint64_t max_len):
+def maybe_indices_to_slice(ndarray[intp_t, ndim=1] indices, intp_t max_len):
     cdef:
         Py_ssize_t i, n = len(indices)
-        uint64_t k, vstart, vlast, v
+        intp_t k, vstart, vlast, v
 
     if n == 0:
         return slice(0, 0)