Tools: Testbench: Fix non-specified output rate impact (MCPS)

If the -R <rate> is omitted the Xtensa version of sof-testbench4
reports the consumed MCPS as zero. The fix is to copy the output
rate from input rate value (-r <rate>) if output rate is zero.

Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>

Author: singalsu

tools/testbench/testbench.c

@@ -450,6 +450,9 @@ int main(int argc, char **argv)
 	if (!tp->channels_out)
 		tp->channels_out = tp->channels_in;
 
+	if (!tp->fs_out)
+		tp->fs_out = tp->fs_in;
+
 	/* check mandatory args */
 	if (!tp->tplg_file) {
 		fprintf(stderr, "topology file not specified, use -t file.tplg\n");