Fix libsodium autodetect without libsodium

Found by @mind04

diff --git a/m4/pdns_check_libsodium.m4 b/m4/pdns_check_libsodium.m4
index b02626b957d9772adcf28280f188b61d10342b36..30e961e89e8178bfbe3c96bb15f5949859b7401e 100644 (file)
--- a/m4/pdns_check_libsodium.m4
+++ b/m4/pdns_check_libsodium.m4
@@ -18,7 +18,7 @@ AC_DEFUN([PDNS_CHECK_LIBSODIUM], [
         AC_CHECK_FUNCS([crypto_box_easy_afternm])
         CFLAGS=$save_CFLAGS
         LIBS=$save_LIBS
-      ])
+      ], [ : ])
     ])
   ])
   AM_CONDITIONAL([LIBSODIUM], [test "x$LIBSODIUM_LIBS" != "x"])