target/arm: fix decoding of B{,L}RA{A,B}

A flawed test lead to the instructions always being treated as
unallocated encodings.

Fixes: https://bugs.launchpad.net/bugs/1813460Signed-off-by: NRemi Denis-Courmont <remi.denis.courmont@huawei.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

target/arm/translate-a64.c

@@ -2036,7 +2036,7 @@ static void disas_uncond_b_reg(DisasContext *s, uint32_t insn)
         if (!dc_isar_feature(aa64_pauth, s)) {
             goto do_unallocated;
         }
-        if (op3 != 2 || op3 != 3) {
+        if ((op3 & ~1) != 2) {
             goto do_unallocated;
         }
         if (s->pauth_active) {