BLD: remove more build warnings (#15191)

Author: jreback

pandas/src/numpy_helper.h

@@ -125,7 +125,7 @@ PyObject* sarr_from_data(PyArray_Descr* descr, int length, void* data) {
 
 void transfer_object_column(char* dst, char* src, size_t stride,
                             size_t length) {
-    int i;
+    size_t i;
     size_t sz = sizeof(PyObject*);
 
     for (i = 0; i < length; ++i) {

pandas/tslib.pyx

@@ -1945,7 +1945,7 @@ cdef inline object _parse_dateabbr_string(object date_string, object default,
                                           object freq):
     cdef:
         object ret
-        int year, quarter, month, mnum, date_len
+        int year, quarter = -1, month, mnum, date_len
 
     # special handling for possibilities eg, 2Q2005, 2Q05, 2005Q1, 05Q1
     assert util.is_string_object(date_string)