Cleanup: Remove const for params passed by value

BUG=aomedia:448

Change-Id: Ieff977fca8a5033ddef2871a194870f59301ad8f
diff --git a/av1/encoder/mcomp.c b/av1/encoder/mcomp.c
index d8fab61..f5745f2 100644
--- a/av1/encoder/mcomp.c
+++ b/av1/encoder/mcomp.c
@@ -362,7 +362,7 @@
   return besterr;
 }
 
-static INLINE int divide_and_round(const int n, const int d) {
+static INLINE int divide_and_round(int n, int d) {
   return ((n < 0) ^ (d < 0)) ? ((n - d / 2) / d) : ((n + d / 2) / d);
 }