ftp: fix using uninitialized value

Fix coverity issue CID 1026777

Signed-off-by: Lukasz Marek <lukasz.m.luki@gmail.com>
Merge remote-tracking branch 'lukaszmluki/master'

* lukaszmluki/master:
  ftp: fix using uninitialized value

Merged-by: Michael Niedermayer <michaelni@gmx.at>