gdb: run black on gdbarch_components.py

Change-Id: Ifcf80faa240c7c235bfea4ddc79f0d6c39858c5e
diff --git a/gdb/gdbarch_components.py b/gdb/gdbarch_components.py
index 5287451..20f9c80 100644
--- a/gdb/gdbarch_components.py
+++ b/gdb/gdbarch_components.py
@@ -1786,7 +1786,7 @@
         ("struct bfd &", "cbfd"),
         ("gdb_byte *", "readbuf"),
         ("ULONGEST", "offset"),
-        ("ULONGEST", "len")
+        ("ULONGEST", "len"),
     ],
     predicate=True,
 )