ppc/xics: remove useless if condition

The previous code section uses a 'first < 0' test and returns. Therefore,
there is no need to test the 'first' variable against '>= 0' afterwards.

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

hw/intc/xics_spapr.c

@@ -329,11 +329,9 @@ int spapr_ics_alloc_block(ICSState *ics, int num, bool lsi,
         return -1;
     }
 
-    if (first >= 0) {
     for (i = first; i < first + num; ++i) {
         ics_set_irq_type(ics, i, lsi);
     }
-    }
     first += ics->offset;
 
     trace_xics_alloc_block(first, num, lsi, align);