Fix integer cast in handleNint

This fixes an incorrect integer cast in the handleNint function
in cppbor_parse.cpp which would trigger UBSAN failures in the
Trusty apploader.

Change-Id: Id35865e524c9837d907fe352feac783b3f7f36b0

1 files changed, 1 insertions, 1 deletions

diff --git a/src/cppbor_parse.cpp b/src/cppbor_parse.cpp
index ab01ee7..f5e8fcf 100644
--- a/src/cppbor_parse.cpp
+++ b/src/cppbor_parse.cpp
@@ -71,7 +71,7 @@ std::tuple<const uint8_t*, ParseClient*> handleNint(uint64_t value, const uint8_
         parseClient->error(hdrBegin, "NINT values that don't fit in int64_t are not supported.");
         return {hdrBegin, nullptr /* end parsing */};
     }
-    std::unique_ptr<Item> item = std::make_unique<Nint>(-1 - static_cast<uint64_t>(value));
+    std::unique_ptr<Item> item = std::make_unique<Nint>(-1 - static_cast<int64_t>(value));
     return {hdrEnd,
             parseClient->item(item, hdrBegin, hdrEnd /* valueBegin */, hdrEnd /* itemEnd */)};
 }