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Cosmetic changes for rate_ctrl experiment

Change-Id: I133c93c2ad4c824fc97a18de3ac2cb2aedac9013

--- a/vp9/encoder/vp9_encoder.c

+++ b/vp9/encoder/vp9_encoder.c

@@ -4257,8 +4257,7 @@

 static double get_bits_percent_diff(int target_bits, int actual_bits) {

   double diff = abs(target_bits - actual_bits) * 1. / target_bits;

-  diff *= 100;

-  return diff;

+  return diff * 100;

 }

 static int rq_model_predict_q_index(const RATE_QSTEP_MODEL *rq_model,

--- a/vp9/encoder/vp9_encoder.h

+++ b/vp9/encoder/vp9_encoder.h

@@ -588,7 +588,7 @@

 }

 typedef struct RATE_QSTEP_MODEL {

-  // The rq model predict the bit usage as follows.

+  // The rq model predicts the bit usage as follows.

   // rate = bias - ratio * log2(q_step)

   int ready;

   double bias;