Fix upcall stubs having incorrect type descriptors

CHANGELOG.md

@@ -1,6 +1,10 @@
 # Change Log
 All notable changes to this project will be documented in this file. This change log follows the conventions of [keepachangelog.com](http://keepachangelog.com/).
 
+## [Unreleased]
+### Fixed
+- Upcall stubs had incorrect types
+
 ## [0.1.176] - 2021-09-29
 ### Fixed
 - Usage of `defcfn` without a docstring produced an invalid `def` form
@@ -15,5 +19,6 @@ All notable changes to this project will be documented in this file. This change
 - Support for serializing and deserializing arbitrary Clojure functions
 - Support for serializing and deserializing arbitrary Clojure data structures
 
+[Unreleased]: https://github.com/IGJoshua/coffi/compare/v0.1.176...HEAD
 [0.1.176]: https://github.com/IGJoshua/coffi/compare/v0.1.169...v0.1.176
 [0.1.169]: https://github.com/IGJoshua/coffi/compare/16f56bc31d69142ec4d2fb61b15b069d78b127ca...v0.1.169

src/clj/coffi/ffi.clj

@@ -314,8 +314,8 @@
                      [:return]]}
              {:name :upcall
               :flags #{:public}
-              :desc (conj (mapv mem/java-layout arg-types)
+              :desc (conj (mapv insn-layout arg-types)
-                          (mem/java-layout ret-type))
+                          (insn-layout ret-type))
               :emit [[:aload 0]
                      [:getfield :this "upcall_ifn" IFn]
                      (map-indexed