t7800-difftool.sh: Simplify the --extcmd test

diff --git a/patch-delta.c b/patch-delta.c
index ed9db81fa82c812c9ffa07f5a40540dbb15da0d3..e02e13bd4eb2a92626c2d6f9cbf264abb15de9c5 100644 (file)
--- a/patch-delta.c
+++ b/patch-delta.c
@@ -2,7 +2,7 @@
  * patch-delta.c:
  * recreate a buffer from a source and the delta produced by diff-delta.c
  *
- * (C) 2005 Nicolas Pitre <nico@cam.org>
+ * (C) 2005 Nicolas Pitre <nico@fluxnic.net>
  *
  * This code is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -44,7 +44,7 @@ void *patch_delta(const void *src_buf, unsigned long src_size,
                        if (cmd & 0x01) cp_off = *data++;
                        if (cmd & 0x02) cp_off |= (*data++ << 8);
                        if (cmd & 0x04) cp_off |= (*data++ << 16);
-                       if (cmd & 0x08) cp_off |= (*data++ << 24);
+                       if (cmd & 0x08) cp_off |= ((unsigned) *data++ << 24);
                        if (cmd & 0x10) cp_size = *data++;
                        if (cmd & 0x20) cp_size |= (*data++ << 8);
                        if (cmd & 0x40) cp_size |= (*data++ << 16);