audio: kpb: log the requested history buffer size on error

When failing to allocate a history buffer, log the original requested
size.

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>

Author: lyakh

src/audio/kpb.c

@@ -853,7 +853,8 @@ static int kpb_prepare(struct comp_dev *dev)
 
 		/* Have we allocated what we requested? */
 		if (kpb->hd.buffer_size < hb_size_req) {
-			comp_cl_err(&comp_kpb, "failed to allocate space for KPB buffer");
+			comp_cl_err(&comp_kpb, "failed to allocate %zu for KPB buffer",
+				    hb_size_req);
 			kpb_free_history_buffer(kpb->hd.c_hb);
 			kpb->hd.c_hb = NULL;
 			kpb->hd.buffer_size = 0;