riscv: Fix no params with nodefault segfault

Fix segfault received when using --nodefault without --params.

Fixes: 7c9aac003925 ("riscv: Generate FDT at runtime for Guest/VM")
Suggested-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
Link: https://lore.kernel.org/r/20250123151339.185908-2-ajones@ventanamicro.com
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Link: https://lore.kernel.org/r/20250426110348.338114-8-apatel@ventanamicro.com
Signed-off-by: Will Deacon <will@kernel.org>
1 file changed