Bug 1448883 - Resync with cubeb 7401fc25a9d. r=padenot

MozReview-Commit-ID: 1Lg0fpsSa10

--HG--
extra : rebase_source : 46d1fac5453a7425705b2c4c97940abaf11fe2d4

media/libcubeb/README_MOZILLA

@@ -5,4 +5,4 @@ Makefile.in build files for the Mozilla build system.
 
 The cubeb git repository is: git://github.com/kinetiknz/cubeb.git
 
-The git commit ID used was 7712aaabfa140e8c7fe890e3f5f65dfe3fe58632 (2018-03-25 11:30:38 +0200)
+The git commit ID used was 7401fc25a9d87ed57d49648883e3e5658305c1cb (2018-03-26 16:54:01 +0200)

media/libcubeb/src/cubeb.c

@@ -68,7 +68,7 @@ validate_stream_params(cubeb_stream_params * input_stream_params,
   XASSERT(input_stream_params || output_stream_params);
   if (output_stream_params) {
     if (output_stream_params->rate < 1000 || output_stream_params->rate > 192000 ||
-        output_stream_params->channels < 1 || output_stream_params->channels > 8) {
+        output_stream_params->channels < 1) {
       return CUBEB_ERROR_INVALID_FORMAT;
     }
   }