push: fix compilation with --disable-management and --enable-werror

push: fix compilation with --disable-management and --enable-werror

The authfail_extended and buf variables are only used when
ENABLE_MANAGEMENT is defined. However, they are currently declared
outside of any ifdefs, thus triggering a warning.

Move the declaration of these 2 down, right before their usage (within
the existing "#ifdef ENABLE_MANAGEMENT" block.

Fixes: ("Cleanup receive_auth_failed and simplify method")
Cc: Arne Schwabe <arne@rfc2549.org>
Signed-off-by: Antonio Quartulli <a@unstable.cc>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20220803154049.1213-1-a@unstable.cc>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg24792.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>