binman: Drop an unnecessary comma in blob handling

This comma is not needed. Drop it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/etype/blob.py b/tools/binman/etype/blob.py
index 642a0e4..ae80bbe 100644
--- a/tools/binman/etype/blob.py
+++ b/tools/binman/etype/blob.py
@@ -60,7 +60,7 @@
             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