linux: Fix broken __riscv64 ifdef
diff --git a/common/protos/linux.c b/common/protos/linux.c
index 80749d00..84202460 100644
--- a/common/protos/linux.c
+++ b/common/protos/linux.c
@@ -378,7 +378,7 @@ struct linux_efi_initrd {
#endif
noreturn void linux_load(char *config, char *cmdline) {
-#if defined(__riscv64__)
+#if defined(__riscv64)
(void)cmdline;
#endif
