CLN: remove unreachable

Author: jbrockmendel

pandas/plotting/_matplotlib/timeseries.py

@@ -10,8 +10,6 @@
 )
 import warnings
 
-import numpy as np
-
 from pandas._libs.tslibs import (
     BaseOffset,
     Period,
@@ -265,13 +263,7 @@ def _get_index_freq(index: Index) -> BaseOffset | None:
     freq = getattr(index, "freq", None)
     if freq is None:
         freq = getattr(index, "inferred_freq", None)
-        if freq == "B":
-            # error: "Index" has no attribute "dayofweek"
-            weekdays = np.unique(index.dayofweek)  # type: ignore[attr-defined]
-            if (5 in weekdays) or (6 in weekdays):
-                freq = None
-
-    freq = to_offset(freq)
+        freq = to_offset(freq)
     return freq