arm64: clang assembler compatability

dl/sp/api/armSP.h

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  *
  *  This file was originally licensed as follows. It has been
@@ skipping 75 matching lines @@
 {
     OMX_U32 N;
     OMX_U16* pBitRev;
     OMX_FC32* pTwiddle;
     OMX_FC32* pBuf;
 } ARMsFFTSpec_FC32;
 
 /*
  * Compute log2(x), where x must be a power of 2.
  */
-static inline OMX_U32 fastlog2(long x) {
-  OMX_U32 out;
+static inline long fastlog2(long x) {
+  long out;
   asm("clz %0,%1\n\t"
       "sub %0, %0, #63\n\t"
       "neg %0, %0\n\t"
       : "=r"(out)
       : "r"(x)
       :);
   return out;
 }
 
 /*
@@ skipping 21 matching lines @@
 #ifdef __cplusplus
 }
 #endif
 
 #endif
 
 /*End of File*/