[PATCH] or1k: Fix compilation hiccup

[Eric Blake <eblake@redhat.com>]

On my Fedora 32 machine, gcc 10.1.1 at -O2 (the default for a bare
'./configure') has a false-positive complaint:

  CC      or1k-softmmu/hw/openrisc/openrisc_sim.o
/home/eblake/qemu/hw/openrisc/openrisc_sim.c: In function ‘openrisc_sim_init’:
/home/eblake/qemu/hw/openrisc/openrisc_sim.c:87:42: error: ‘cpu_irqs[0]’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
   87 |         sysbus_connect_irq(s, i, cpu_irqs[i][irq_pin]);
      |                                  ~~~~~~~~^~~

Initializing both pointers of cpu_irqs[] to NULL is sufficient to shut
up the compiler, even though they are definitely assigned in
openrisc_sim_init() prior to the inlined call to
openrisc_sim_ompic_init() containing the line in question.

Signed-off-by: Eric Blake <eblake@redhat.com>
---
 hw/openrisc/openrisc_sim.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/openrisc/openrisc_sim.c b/hw/openrisc/openrisc_sim.c
index d08ce6181199..95011a8015b4 100644
--- a/hw/openrisc/openrisc_sim.c
+++ b/hw/openrisc/openrisc_sim.c
@@ -129,7 +129,7 @@ static void openrisc_sim_init(MachineState *machine)
     const char *kernel_filename = machine->kernel_filename;
     OpenRISCCPU *cpu = NULL;
     MemoryRegion *ram;
-    qemu_irq *cpu_irqs[2];
+    qemu_irq *cpu_irqs[2] = {};
     qemu_irq serial_irq;
     int n;
     unsigned int smp_cpus = machine->smp.cpus;
-- 
2.26.2