CLN: Remove unreachable code in timedeltas.pyx (pandas-dev#48198)

Author: kianelbo

pandas/_libs/tslibs/timedeltas.pyx

@@ -235,7 +235,7 @@ cpdef int64_t delta_to_nanoseconds(
 
     cdef:
         NPY_DATETIMEUNIT in_reso
-        int64_t n, value, factor
+        int64_t n
 
     if is_tick_object(delta):
         n = delta.n
@@ -278,8 +278,6 @@ cpdef int64_t delta_to_nanoseconds(
             f"Cannot cast {str(delta)} to unit={unit_str} without overflow."
         ) from err
 
-    return value
-
 
 @cython.overflowcheck(True)
 cdef object ensure_td64ns(object ts):