qtest: Use qemu_opt_set() instead of qemu_opts_parse()

Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

qtest.c

@@ -520,16 +520,13 @@ static void qtest_event(void *opaque, int event)
     }
 }
 
-static void configure_qtest_icount(const char *options)
+static int qtest_init_accel(MachineState *ms)
 {
-    QemuOpts *opts  = qemu_opts_parse(qemu_find_opts("icount"), options, 1);
+    QemuOpts *opts = qemu_opts_create(qemu_find_opts("icount"), NULL, 0,
+                                      &error_abort);
+    qemu_opt_set(opts, "shift", "0", &error_abort);
     configure_icount(opts, &error_abort);
     qemu_opts_del(opts);
-}
-
-static int qtest_init_accel(MachineState *ms)
-{
-    configure_qtest_icount("0");
     return 0;
 }