All calls to ftruncate() must have their return code checked.

All calls to ftruncate() must have their return code checked.
Under FC11 rpm builds by default add the --fortify-source option which
ensures that functions flagged with certain attributes must have their
return codes checked.  Normally this is just a warning but we always
build with -Werror so this is fatal.  Simply wrap the function in a
verify call to ensure we catch a failure if there is one.