audio_coding/codecs/ilbc: Replaced macro WEBRTC_SPL_RSHIFT_W32 with >>

Removed usage of trivial macro.

BUG=3348,3353
TESTED=locally on linux and trybots
R=henrik.lundin@webrtc.org, kwiberg@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/29789004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7480 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/audio_coding/codecs/ilbc/interpolate.c b/webrtc/modules/audio_coding/codecs/ilbc/interpolate.c
index b6ea201..d0869a5 100644
--- a/webrtc/modules/audio_coding/codecs/ilbc/interpolate.c
+++ b/webrtc/modules/audio_coding/codecs/ilbc/interpolate.c
@@ -39,9 +39,7 @@
 
   invcoef = 16384 - coef; /* 16384 = 1.0 (Q14)*/
   for (i = 0; i < length; i++) {
-    out[i] = (int16_t) WEBRTC_SPL_RSHIFT_W32(
-        (WEBRTC_SPL_MUL_16_16(coef, in1[i]) + WEBRTC_SPL_MUL_16_16(invcoef, in2[i]))+8192,
-        14);
+    out[i] = (int16_t)((coef * in1[i] + invcoef * in2[i] + 8192) >> 14);
   }
 
   return;