[PATCH 4/7] x86/irq: Make create_irq() compile at -Og

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

When compiling at -Og:

  irq.c: In function ‘create_irq’:
  irq.c:310:38: error: ‘desc’ may be used uninitialized in this 
function[-Werror=maybe-uninitialized]
               desc->arch.creator_domid = currd->domain_id;
               ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~

This diagnostic is bogus, because desc is already read on earlier paths.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Jan Beulich <JBeulich@xxxxxxxx>
CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
CC: Wei Liu <wl@xxxxxxx>
---
 xen/arch/x86/irq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/irq.c b/xen/arch/x86/irq.c
index a1693f92dd..72b86c6155 100644
--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -264,7 +264,7 @@ void __init clear_irq_vector(int irq)
 int create_irq(nodeid_t node, bool grant_access)
 {
     int irq, ret;
-    struct irq_desc *desc;
+    struct irq_desc *desc = NULL;
 
     for (irq = nr_irqs_gsi; irq < nr_irqs; irq++)
     {
-- 
2.11.0