memblockq: Improve debuggability by storing a name and a sample spec.

These are not used for anything at this point, but this
makes it easy to add ad-hoc debug prints that show the
memblockq name and to convert between bytes and usecs.

src/pulse/stream.c

@@ -1140,10 +1140,11 @@ void pa_create_stream_callback(pa_pdispatch *pd, uint32_t command, uint32_t tag,
         pa_assert(!s->record_memblockq);
 
         s->record_memblockq = pa_memblockq_new(
+                "client side record memblockq",
                 0,
                 s->buffer_attr.maxlength,
                 0,
-                pa_frame_size(&s->sample_spec),
+                &s->sample_spec,
                 1,
                 0,
                 0,