Work around for scan-build false positive

This results in a error:
$ scan-build cmake -B build .
$ scan-build --status-bugs make -C build

It's a false possitive but can be fixed with this commit.

src/binson.cpp

@@ -233,8 +233,10 @@ void Binson::deseralizeItems(binson_parser *p)
         bbuf *buf;
         buf = binson_parser_get_name(p);
         CheckParserState(p);
-        ifRuntimeError(buf != nullptr, "buf is null");
-        ifRuntimeError(buf->bptr != nullptr, "buf->bptr is null");
+        if (buf == nullptr)
+            throw std::runtime_error("buf is null");
+        if (buf->bptr == nullptr)
+            throw std::runtime_error("buf->bptr is null");
         string name(reinterpret_cast<const char*>(buf->bptr), buf->bsize);
         put(name, deseralizeItem(p));
     }