audio: Use labs() instead of abs()

* abs() accepts ints as parameters,
  but this breaks compile since
  the times are longs, not ints
* Use labs() instead, which accepts
  longs as parameters, to fix compile

Change-Id: I8f980a78380cdae18abd5b9602e281beae3ee4d3
Signed-off-by: Paul Keith <javelinanddart@aidenswann.com>

audio/audio_hw.c

@@ -262,8 +262,8 @@ struct timespec time_spec_diff(struct timespec time1, struct timespec time0) {
         time0.tv_sec -= xsec;
     }
 
-    ret.tv_sec = abs(time1.tv_sec - time0.tv_sec);
-    ret.tv_nsec = abs(time1.tv_nsec - time0.tv_nsec);
+    ret.tv_sec = labs(time1.tv_sec - time0.tv_sec);
+    ret.tv_nsec = labs(time1.tv_nsec - time0.tv_nsec);
 
     return ret;
 }