spapr/xive: Turn some sanity checks into assertions

The sPAPR XIVE device is created by the machine in spapr_irq_init().
The latter overrides any value provided by the user with -global for
the "nr-irqs" and "nr-ends" properties with strictly positive values.

It seems reasonable to assume these properties should never be 0,
which wouldn't make much sense by the way.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <20201120174646.619395-2-groug@kaod.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

hw/intc/spapr_xive.c

@@ -296,22 +296,16 @@ static void spapr_xive_realize(DeviceState *dev, Error **errp)
     XiveENDSource *end_xsrc = &xive->end_source;
     Error *local_err = NULL;
 
+    /* Set by spapr_irq_init() */
+    g_assert(xive->nr_irqs);
+    g_assert(xive->nr_ends);
+
     sxc->parent_realize(dev, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         return;
     }
 
-    if (!xive->nr_irqs) {
-        error_setg(errp, "Number of interrupt needs to be greater 0");
-        return;
-    }
-
-    if (!xive->nr_ends) {
-        error_setg(errp, "Number of interrupt needs to be greater 0");
-        return;
-    }
-
     /*
      * Initialize the internal sources, for IPIs and virtual devices.
      */