Fix size of value from vpiTypespec

Signed-off-by: Kamil Rakoczy <krakoczy@antmicro.com>

uhdm-plugin/UhdmAst.cc

diff --git a/uhdm-plugin/UhdmAst.cc b/uhdm-plugin/UhdmAst.cc
index fd6f3f0..1d88f21 100644
--- a/uhdm-plugin/UhdmAst.cc
+++ b/uhdm-plugin/UhdmAst.cc
@@ -1093,7 +1093,7 @@
             visit_one_to_one({vpiTypespec}, obj_h, [&](AST::AstNode *node) {
                 if (node && node->attributes.count(UhdmAst::packed_ranges()) && node->attributes[UhdmAst::packed_ranges()]->children.size() &&
                     node->attributes[UhdmAst::packed_ranges()]->children[0]->children.size()) {
-                    size = node->attributes[UhdmAst::packed_ranges()]->children[0]->children[0]->integer;
+                    size = node->attributes[UhdmAst::packed_ranges()]->children[0]->children[0]->integer + 1;
                 }
             });
             if (size == -1) {