kernel: release descriptors when rejecting read-only truncation (#504)

Co-authored-by: nmzik <Nmzik@mail.ru>

src/kernel/fileSystem.cpp

@@ -458,6 +458,7 @@ int KYTY_SYSV_ABI KernelOpen(const char* path, int flags, uint16_t mode) {
 	file->real_name = g_mount_points->ResolvePath(file->name);
 
 	if (trunc && rw_mode == Common::File::Mode::Read) {
+		g_files->DeleteDescriptor(descriptor);
 		return KERNEL_ERROR_EACCES;
 	}