This was guarding against a full fifo rather than an empty fifo when
popping. Fix.
Signed-off-by: NPeter Crosthwaite <peter.crosthwaite@xilinx.com>
Reviewed-by: NMartin Kletzander <mkletzan@redhat.com>
Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>