Fix argument type for ldap_parse_page_control in configure probe,
to suppress an incompatible-pointer-types error.

Submitted upstream:

  <https://lore.kernel.org/autofs/874jgf4qwu.fsf@oldenburg.str.redhat.com/>

diff --git a/aclocal.m4 b/aclocal.m4
index 1046d72b1560a8ea..8dad987224fe5094 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -427,7 +427,7 @@ AC_LINK_IFELSE(
       struct berval *c;
       int ret;
       LDAPControl **clp;
-      ret = ldap_parse_page_control(ld,clp,ct,c); ]])],
+      ret = ldap_parse_page_control(ld,clp,ct,&c); ]])],
   [ af_have_ldap_parse_page_control=yes
     AC_MSG_RESULT(yes) ],
   [ AC_MSG_RESULT(no) ])