vp8: Fix compiler warning in vp8 pickinter.c

Change-Id: I0e5714538fe53d885a2201d808846901ae8fc288
diff --git a/vp8/encoder/pickinter.c b/vp8/encoder/pickinter.c
index d59bd33..eb713f1 100644
--- a/vp8/encoder/pickinter.c
+++ b/vp8/encoder/pickinter.c
@@ -207,8 +207,8 @@
   (void)mvcost;
   (void)distortion;
   (void)sse;
-  bestmv->as_mv.row <<= 3;
-  bestmv->as_mv.col <<= 3;
+  bestmv->as_mv.row *= 8;
+  bestmv->as_mv.col *= 8;
   return 0;
 }