gpgscm: Build well even if NDEBUG defined.

gpgscm: Build well even if NDEBUG defined.

* gpgscm/scheme.c (gc_reservation_failure): Fix adding ";".
[!NDEBUG] (scheme_init_custom_alloc): Don't init seserved_lineno.

--

Cherry icked from master commit of:
	e140c6d4f581be1a60a34b67b16430452f3987e8

In some build environment, NDEBUG is defined (although it's
bad practice).  This change supports such a situation.

GnuPG-bug-id: 3959
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
(cherry picked from commit 8161afb9dddaba839be92fbe9d85c05235eda825)

Gbp-Pq: Topic from-2.2.14
Gbp-Pq: Name gpgscm-Build-well-even-if-NDEBUG-defined.patch