[PATCH 3/3 nft] configure: fix --enable-debug

[Pablo Neira Ayuso <pablo@netfilter.org>]

As the documentation indicates "The most common mistake for this macro is to
consider the two actions as action-if-enabled and action-if-disabled."

Use AS_IF in the action-if-present to check the real argument that we're
getting from the user.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 configure.ac |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index d8f949a..931dbe1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -23,8 +23,8 @@ AC_DEFINE([_GNU_SOURCE], [], [Enable various GNU extensions])
 AC_DEFINE([_STDC_FORMAT_MACROS], [], [printf-style format macros])
 
 AC_ARG_ENABLE([debug],
-	      AS_HELP_STRING([--enable-debug], [Enable debugging]),
-	      [with_debug=no],
+	      AS_HELP_STRING([--enable-debug], [Disable debugging]),
+	      AS_IF([test "x$enable_debug" = "xno"], [with_debug=no], [with_debug=yes]),
 	      [with_debug=yes])
 AC_SUBST(with_debug)
 AM_CONDITIONAL([BUILD_DEBUG], [test "x$with_debug" != xno])
-- 
1.7.10.4