Bug 917246 - Make the tree compile with --enable-pulse. r=jesup

--HG--
extra : rebase_source : 83d648e4af08e27bc9b29a9450722c3d5d2278c7

media/libcubeb/src/cubeb_pulse.c

@@ -584,7 +584,7 @@ pulse_stream_get_latency(cubeb_stream * stm, uint32_t * latency)
     return CUBEB_ERROR;
   }
 
-  *latency = (r_usec * stm->sample_spec.rate) / PR_NSEC_PER_SEC;
+  *latency = r_usec * stm->sample_spec.rate / PA_USEC_PER_SEC;
   return CUBEB_OK;
 }