Merge branch 'jk/diff-filespec-cleanup'

Portability fix to a topic already in v1.9

* jk/diff-filespec-cleanup:
  diffcore.h: be explicit about the signedness of is_binary

Author: gitster

Diff for: diffcore.h

@@ -46,7 +46,7 @@ struct diff_filespec {
 	unsigned is_stdin : 1;
 	unsigned has_more_entries : 1; /* only appear in combined diff */
 	/* data should be considered "binary"; -1 means "don't know yet" */
-	int is_binary : 2;
+	signed int is_binary : 2;
 	struct userdiff_driver *driver;
 };