[PATCH v2] target/i386: Remove compilation errors when -Werror=maybe-uninitialized

[Eric Auger]

To avoid compilation errors when -Werror=maybe-uninitialized is used,
replace 'case 3' by 'default'.

Otherwise we get:

../target/i386/ops_sse.h: In function ‘helper_vpermdq_ymm’:
../target/i386/ops_sse.h:2495:13: error: ‘r3’ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
   2495 |     d->Q(3) = r3;
        |     ~~~~~~~~^~~~
../target/i386/ops_sse.h:2494:13: error: ‘r2’ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
   2494 |     d->Q(2) = r2;
        |     ~~~~~~~~^~~~
../target/i386/ops_sse.h:2493:13: error: ‘r1’ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
   2493 |     d->Q(1) = r1;
        |     ~~~~~~~~^~~~
../target/i386/ops_sse.h:2492:13: error: ‘r0’ may be used
uninitialized in this function [-Werror=maybe-uninitialized]
   2492 |     d->Q(0) = r0;
        |     ~~~~~~~~^~~~

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Suggested-by: Stefan Weil <sw@weilnetz.de>
Fixes: 790684776861 ("target/i386: reimplement 0x0f 0x3a, add AVX")
---
 target/i386/ops_sse.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/target/i386/ops_sse.h b/target/i386/ops_sse.h
index 3cbc36a59d..c442c8c10c 100644
--- a/target/i386/ops_sse.h
+++ b/target/i386/ops_sse.h
@@ -2466,7 +2466,7 @@ void helper_vpermdq_ymm(Reg *d, Reg *v, Reg *s, uint32_t 
order)
         r0 = s->Q(0);
         r1 = s->Q(1);
         break;
-    case 3:
+    default:
         r0 = s->Q(2);
         r1 = s->Q(3);
         break;
@@ -2484,7 +2484,7 @@ void helper_vpermdq_ymm(Reg *d, Reg *v, Reg *s, uint32_t 
order)
         r2 = s->Q(0);
         r3 = s->Q(1);
         break;
-    case 3:
+    default:
         r2 = s->Q(2);
         r3 = s->Q(3);
         break;
-- 
2.37.3