ringtest: fix an assert statement

There is an || vs && typo so the assert can never be triggered.

Signed-off-by: Dan Carpenter <[e-mail]>
Signed-off-by: Michael S. Tsirkin <[e-mail]>
Acked-by: Jason Wang <[e-mail]>

tools/virtio/ringtest/main.c

···
 	cpu = strtol(arg, &endptr, 0);
 	assert(!*endptr);
 
-	assert(cpu >= 0 || cpu < CPU_SETSIZE);
+	assert(cpu >= 0 && cpu < CPU_SETSIZE);
 
 	self = pthread_self();
 	CPU_ZERO(&cpuset);