aio-posix: drop QEMU_AIO_POLL_MAX_NS env var

This hunk should not have been merged but I forgot to remove it.  Let's
remove it before it slips into a QEMU release.

¯\_(ツ)_/¯
Reviewed-by: NThomas Huth <thuth@redhat.com>
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
Message-id: 20171103154041.12617-1-stefanha@redhat.com
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>

util/aio-posix.c

@@ -701,13 +701,6 @@ bool aio_poll(AioContext *ctx, bool blocking)
 
 void aio_context_setup(AioContext *ctx)
 {
-    /* TODO remove this in final patch submission */
-    if (getenv("QEMU_AIO_POLL_MAX_NS")) {
-        fprintf(stderr, "The QEMU_AIO_POLL_MAX_NS environment variable has "
-                "been replaced with -object iothread,poll-max-ns=NUM\n");
-        exit(1);
-    }
-
 #ifdef CONFIG_EPOLL_CREATE1
     assert(!ctx->epollfd);
     ctx->epollfd = epoll_create1(EPOLL_CLOEXEC);