Fix size bug on DOS_NT introduced by CIFS workaround.

* fileio.c (Fwrite_region): Use O_BINARY in checking code, too.

Fixes: debbugs:13149

src/ChangeLog

 2013-01-19  Paul Eggert  <eggert@cs.ucla.edu>
+	Fix size bug on DOS_NT introduced by CIFS workaround (Bug#13149).
+	* fileio.c (Fwrite_region): Use O_BINARY in checking code, too.
+
 	Allow floating-point file offsets.
 	Problem reported by Vitalie Spinu in
 	<http://lists.gnu.org/archive/html/emacs-devel/2013-01/msg00411.html>.

src/fileio.c

@@ -4989,7 +4989,7 @@ This calls `write-region-annotate-functions' at the start, and
   if (EMACS_TIME_VALID_P (modtime)
       && ! (valid_timestamp_file_system && st.st_dev == timestamp_file_system))
     {
-      int desc1 = emacs_open (fn, O_WRONLY, 0);
+      int desc1 = emacs_open (fn, O_WRONLY | O_BINARY, 0);
       if (0 <= desc1)
 	{
 	  struct stat st1;