Fix redundant dictionary update.

QuLogic · QuLogic · commit 9909aeb43474 · 2020-05-07T00:36:25.000-04:00
The `for` loop is supposed to check all fields in `kw` here, but `kw`
does not change, so doing `kwargs.update(kw)` in the loop is a waste.
diff --git a/lib/matplotlib/axis.py b/lib/matplotlib/axis.py
@@ -879,7 +879,7 @@ def _translate_tick_kw(kw):
                 raise ValueError(
                     "keyword %s is not recognized; valid keywords are %s"
                     % (key, kwkeys))
-            kwtrans.update(kw)
+        kwtrans.update(kw)
         return kwtrans
 
     def set_clip_path(self, clippath, transform=None):
