firmware: smccc: Fix use of uninitialised results structure

Commit 35727af ("irqchip/gicv3: Workaround for NVIDIA erratum
T241-FABRIC-4") moved the initialisation of the SoC version to
arm_smccc_version_init() but forgot to update the results structure
and it's usage.

Fix the use of the uninitialised results structure and update the
error strings.

Fixes: 35727af ("irqchip/gicv3: Workaround for NVIDIA erratum T241-FABRIC-4")
Signed-off-by: Punit Agrawal <punit.agrawal@bytedance.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Vikram Sethi <vsethi@nvidia.com>
Cc: Shanker Donthineni <sdonthineni@nvidia.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230717171702.424253-1-punit.agrawal@bytedance.com
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

Author: Punit Agrawal

drivers/firmware/smccc/soc_id.c

@@ -34,7 +34,6 @@ static struct soc_device_attribute *soc_dev_attr;
 
 static int __init smccc_soc_init(void)
 {
-	struct arm_smccc_res res;
 	int soc_id_rev, soc_id_version;
 	static char soc_id_str[20], soc_id_rev_str[12];
 	static char soc_id_jep106_id_str[12];
@@ -49,13 +48,13 @@ static int __init smccc_soc_init(void)
 	}
 
 	if (soc_id_version < 0) {
-		pr_err("ARCH_SOC_ID(0) returned error: %lx\n", res.a0);
+		pr_err("Invalid SoC Version: %x\n", soc_id_version);
 		return -EINVAL;
 	}
 
 	soc_id_rev = arm_smccc_get_soc_id_revision();
 	if (soc_id_rev < 0) {
-		pr_err("ARCH_SOC_ID(1) returned error: %lx\n", res.a0);
+		pr_err("Invalid SoC Revision: %x\n", soc_id_rev);
 		return -EINVAL;
 	}