call flush on the wrapped writebuffered FileFd

The flush call is a no-op in most FileFd implementations so this isn't
as critical as it might sound as the only non-trivial implementation is
in the buffered writer, which tends not be used to buffer another
buffer…

(cherry picked from commit 8ca481e8419c19b6ef9074b68cc028177a507161)

1 files changed, 1 insertions, 2 deletions

diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index ef88f6fdd..b041ef131 100644
--- a/apt-pkg/contrib/fileutl.cc
+++ b/apt-pkg/contrib/fileutl.cc
@@ -1258,9 +1258,8 @@ public:
 
 	 writebuffer.bufferstart += written;
       }
-
       writebuffer.reset();
-      return true;
+      return wrapped->InternalFlush();
    }
    virtual ssize_t InternalWrite(void const * const From, unsigned long long const Size) APT_OVERRIDE
    {