MAINT: Initialize year to silence warning (#35763)

Initialize year to silence warning due to subtracting from
value that compiler cannot reason must be either initialized
or never reached

closes #35622

Author: bashtage

pandas/_libs/tslibs/parsing.pyx

@@ -381,7 +381,8 @@ cdef inline object _parse_dateabbr_string(object date_string, datetime default,
                                           object freq):
     cdef:
         object ret
-        int year, quarter = -1, month, mnum, date_len
+        # year initialized to prevent compiler warnings
+        int year = -1, quarter = -1, month, mnum, date_len
 
     # special handling for possibilities eg, 2Q2005, 2Q05, 2005Q1, 05Q1
     assert isinstance(date_string, str)