ACPI: CPPC: Drop redundant local variable from cpc_read()

The ret_val local variable in cpc_read() is not necessary, so
eliminate it.

No functional impact.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Huang Rui <ray.huang@amd.com>

drivers/acpi/cppc_acpi.c

@@ -915,14 +915,13 @@ int __weak cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val)
 
 static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val)
 {
-	int ret_val = 0;
 	void __iomem *vaddr = NULL;
 	int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu);
 	struct cpc_reg *reg = &reg_res->cpc_entry.reg;
 
 	if (reg_res->type == ACPI_TYPE_INTEGER) {
 		*val = reg_res->cpc_entry.int_value;
-		return ret_val;
+		return 0;
 	}
 
 	*val = 0;
@@ -968,10 +967,10 @@ static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val)
 	default:
 		pr_debug("Error: Cannot read %u bit width from PCC for ss: %d\n",
 			 reg->bit_width, pcc_ss_id);
-		ret_val = -EFAULT;
+		return -EFAULT;
 	}
 
-	return ret_val;
+	return 0;
 }
 
 static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val)