BUG/MINOR: rules: Increment be_counters if backend is assigned for a silent-drop

Backend counters must be incremented only if a backend was already assigned to
the stream (when the stream exists). Otherwise, it means we are still on the
frontend side.

This patch may be backported as far as 1.6.

(cherry picked from commit ddc005ae5783b6479292156b97db7b6fbdabf6a3)
Signed-off-by: Willy Tarreau <w@1wt.eu>
(cherry picked from commit 78b992f7bf1bf68dbd97782dcf4b89ea19203181)
Signed-off-by: Willy Tarreau <w@1wt.eu>
1 file changed