[PATCH] riscv/efi_stub: Fix get_boot_hartid_from_fdt() return value

[Heinrich Schuchardt]

On 1/28/22 05:50, Sunil V L wrote:
> The get_boot_hartid_from_fdt() function currently returns U32_MAX
> for failure case which is not correct because U32_MAX is a valid
> hartid value. This patch fixes the issue by returning error code.
> 
> Fixes: d7071743db31 ("RISC-V: Add EFI stub support.")
> Cc: stable at vger.kernel.org
> 
> Signed-off-by: Sunil V L <sunilvl at ventanamicro.com>

Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>