Remove unneeded list comprehension

Author: cgohlke

lib/matplotlib/_cm_listed.py

@@ -1038,5 +1038,4 @@
     cmaps[name] = ListedColormap(data, name=name)
     # generate reversed colormap
     name = name + '_r'
-    data = [rgb for rgb in reversed(data)]
-    cmaps[name] = ListedColormap(data, name=name)
+    cmaps[name] = ListedColormap(list(reversed(data)), name=name)