[GlobalIoContext] use correct types

Thanks llvm 12 :)

emper/io/GlobalIoContext.cpp

@@ -123,7 +123,7 @@ auto GlobalIoContext::globalCompleterFunc(void* arg) -> void* {
 			case PointerTags::Future: {
 				auto* future = tptr.getPtr<Future>();
 
-				uint32_t res = cqe->res;
+				int32_t res = cqe->res;
 
 				future->recordCompletion(globalIoContext->stats, res);
 				future->completeFromAnywhere(res);
@@ -152,7 +152,7 @@ void GlobalIoContext::startGlobalCompleter() {
 
 void GlobalIoContext::initiateTermination() {
 	uint64_t write_buf = 1;
-	int bytes_written = write(notificationEventFd, &write_buf, sizeof(write_buf));
+	ssize_t bytes_written = write(notificationEventFd, &write_buf, sizeof(write_buf));
 	if (bytes_written != sizeof(write_buf)) {
 		DIE_MSG_ERRNO("Writing to globalIo termination eventfd failed");
 	}