binman: Drop an unnecessary comma in blob handling

This comma is not needed. Drop it.
Signed-off-by: NSimon Glass <sjg@chromium.org>

tools/binman/etype/blob.py

@@ -60,7 +60,7 @@ class Entry_blob(Entry):
             except AttributeError:
                 data = lz4.compress(data)
             '''
-            data = tools.Run('lz4', '-c', self._pathname, )
+            data = tools.Run('lz4', '-c', self._pathname)
         self.SetContents(data)
         return True