cpufreq: intel_pstate: Remove unnecessary type casting in div_s64() call

div_s64() accepts the divisor parameter as s32. Helper div_fp()
also accepts divisor as int32_t.

So, remove the unnecessary int64_t type casting.
Signed-off-by: NStratos Karafotis <stratosk@semaphore.gr>
Signed-off-by: NDirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/intel_pstate.c

@@ -50,7 +50,7 @@ static inline int32_t mul_fp(int32_t x, int32_t y)
 
 static inline int32_t div_fp(int32_t x, int32_t y)
 {
-	return div_s64((int64_t)x << FRAC_BITS, (int64_t)y);
+	return div_s64((int64_t)x << FRAC_BITS, y);
 }
 
 struct sample {