CLN: remove unnecessary is not None check

Author: AlexKirko

pandas/_libs/tslibs/conversion.pyx

@@ -383,11 +383,10 @@ cdef _TSObject convert_datetime_to_tsobject(datetime ts, object tz,
     else:
         obj.value = pydatetime_to_dt64(ts, &obj.dts)
         # GH 24329 Take DST offset into account
-        if ts.tzinfo is not None:
-            if treat_tz_as_dateutil(ts.tzinfo):
-                if ts.tzinfo.is_ambiguous(ts):
-                    dst_offset = ts.tzinfo.dst(ts)
-                    obj.value += int(dst_offset.total_seconds() * 1e9)
+        if treat_tz_as_dateutil(ts.tzinfo):
+            if ts.tzinfo.is_ambiguous(ts):
+                dst_offset = ts.tzinfo.dst(ts)
+                obj.value += int(dst_offset.total_seconds() * 1e9)
         obj.tzinfo = ts.tzinfo
 
     if obj.tzinfo is not None and not is_utc(obj.tzinfo):