Revert "MDB_DEBUG tweak for old compilers"

This reverts commit ef2092eac9.

libraries/libmdb/mdb.c

@@ -3683,17 +3683,16 @@ static void
 mdb_cursor_pop(MDB_cursor *mc)
 {
 	if (mc->mc_snum) {
+#if MDB_DEBUG
+		MDB_page	*top = mc->mc_pg[mc->mc_top];
+#endif
 		mc->mc_snum--;
 		if (mc->mc_snum)
 			mc->mc_top--;
-#if MDB_DEBUG
+
-		{
-		MDB_page	*top = mc->mc_pg[mc->mc_top];
 		DPRINTF("popped page %zu off db %u cursor %p", top->mp_pgno,
 			mc->mc_dbi, (void *) mc);
 	}
-#endif
-	}
 }
 
 /** Push a page onto the top of the cursor's stack. */