[PATCH v2] arm/translate-a64: fix uninitialized variable warning

[pannengyuan]

From: Pan Nengyuan <address@hidden>

Fixes:
target/arm/translate-a64.c: In function 'disas_crypto_three_reg_sha512':
target/arm/translate-a64.c:13625:9: error: 'genfn' may be used uninitialized in 
this function [-Werror=maybe-uninitialized]
    genfn(tcg_rd_ptr, tcg_rn_ptr, tcg_rm_ptr);
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
qemu/target/arm/translate-a64.c:13609:8: error: 'feature' may be used 
uninitialized in this function [-Werror=maybe-uninitialized]
    if (!feature) {

Reported-by: Euler Robot <address@hidden>
Signed-off-by: Pan Nengyuan <address@hidden>
---
Changes v2 to v1:
- add a default label to fix uninitialized warnings(suggested by Richard 
Henderson)
---
 target/arm/translate-a64.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index d4bebbe629..63a3d26687 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -13585,6 +13585,8 @@ static void disas_crypto_three_reg_sha512(DisasContext 
*s, uint32_t insn)
             feature = dc_isar_feature(aa64_sha3, s);
             genfn = NULL;
             break;
+        default:
+            g_assert_not_reached();
         }
     } else {
         switch (opcode) {
-- 
2.21.0.windows.1