ACPI: RISC-V: Fix FFH_CPPC_CSR error handling

commit 5b37065 upstream.

The cppc_ffh_csr_read() and cppc_ffh_csr_write() returns Linux error
code in "data->ret.error" so cpc_read_ffh() and cpc_write_ffh() must
not use sbi_err_map_linux_errno() for FFH_CPPC_CSR.

Fixes: 30f3ffb ("ACPI: RISC-V: Add CPPC driver")
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Troy Mitchell <troy.mitchell@linux.dev>
Reviewed-by: Sunil V L <sunilvl@ventanamicro.com>
Reviewed-by: Nutty Liu <nutty.liu@hotmail.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20250818143600.894385-2-apatel@ventanamicro.com
Signed-off-by: Paul Walmsley <pjw@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: avpatel

drivers/acpi/riscv/cppc.c

@@ -121,7 +121,7 @@ int cpc_read_ffh(int cpu, struct cpc_reg *reg, u64 *val)
 
 		*val = data.ret.value;
 
-		return (data.ret.error) ? sbi_err_map_linux_errno(data.ret.error) : 0;
+		return data.ret.error;
 	}
 
 	return -EINVAL;
@@ -150,7 +150,7 @@ int cpc_write_ffh(int cpu, struct cpc_reg *reg, u64 val)
 
 		smp_call_function_single(cpu, cppc_ffh_csr_write, &data, 1);
 
-		return (data.ret.error) ? sbi_err_map_linux_errno(data.ret.error) : 0;
+		return data.ret.error;
 	}
 
 	return -EINVAL;