negative number from FTP

[Justin C. Sherrill]

I'm backing up one of my machines (DragonFly 1.2) to another (DragonFly
1.4) before upgrading.  I used FTP from the 1.4 machine to the 1.2 machine
to bring over a 3.3G tarball, and at the end of the download, it printed
this:

226 Transfer complete.
-960809325 bytes received in 30:36 (1.73 MB/s)

It appears the ftp program appears to not be using a big enough variable
to track size.  I don't know if this is inherited from FreeBSD's ftp, as I
don't have a FreeBSD system with which to test.