ACPI: CPPC: Drop check for non zero perf ratio

perf_ratio is a u64 and SCHED_CAPACITY_SCALE is a large number.
Shifting by one will never have a zero value.

Drop the check.
Suggested-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Reviewed-by: Gautham R. Shenoy <gautham.sheoy@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>

arch/x86/kernel/acpi/cppc.c

@@ -91,13 +91,8 @@ static void amd_set_max_freq_ratio(void)
 		return;
 	}
 
-	perf_ratio = div_u64(numerator * SCHED_CAPACITY_SCALE, nominal_perf);
 	/* midpoint between max_boost and max_P */
-	perf_ratio = (perf_ratio + SCHED_CAPACITY_SCALE) >> 1;
-	if (!perf_ratio) {
-		pr_debug("Non-zero highest/nominal perf values led to a 0 ratio\n");
-		return;
-	}
+	perf_ratio = (div_u64(numerator * SCHED_CAPACITY_SCALE, nominal_perf) + SCHED_CAPACITY_SCALE) >> 1;
 
 	freq_invariance_set_perf_ratio(perf_ratio, false);
 }