Fix statfs failure due to invalid value for ffree

fs/cifs/CHANGES

 Version 0.81
 ------------
 Finish up CIFS packet digital signing for the default
-NTLM security case. 
+NTLM security case. This should help Windows 2003
+network interoperability since it is common for
+packet signing to be required now. Fix statfs (stat -f)
+which recently started returning errors due to 
+invalid value (-1 instead of 0) being set in the
+struct kstatfs f_ffiles field.
 
 Version 0.80
 -----------

fs/cifs/cifsfs.c

@@ -165,7 +165,7 @@ cifs_statfs(struct super_block *sb, struct kstatfs *buf)
 					   able to support more than this, but best to be safe
 					   since Win2k and others can not handle very long filenames */
 	buf->f_files = 0;	/* undefined */
-	buf->f_ffree = -1;	/* unlimited */
+	buf->f_ffree = 0;	/* unlimited */
 
 	rc = CIFSSMBQFSInfo(xid, pTcon, buf, cifs_sb->local_nls);