fix for stricter compilers; latest XCode/LLVM
diff --git a/test/float_tests.c b/test/float_tests.c
index 54683c3..569e40c 100644
--- a/test/float_tests.c
+++ b/test/float_tests.c
@@ -436,8 +436,8 @@
     QCBOREncode_CloseMap(&EC);
 
     UsefulBufC EncodedHalfs;
-    int nReturn = QCBOREncode_Finish(&EC, &EncodedHalfs);
-    if(nReturn) {
+    QCBORError uErr = QCBOREncode_Finish(&EC, &EncodedHalfs);
+    if(uErr) {
         return -1;
     }