target/arm: Fix SME ST1Q

A typo, noted in the bug report, resulting in an
incorrect write offset.

Cc: qemu-stable@nongnu.org
Fixes: 7390e0e ("target/arm: Implement SME LD1, ST1")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1833
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20230818214255.146905-1-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
(cherry picked from commit 4b3520f)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

target/arm/sme_helper.c

@@ -412,7 +412,7 @@ static inline void HNAME##_host(void *za, intptr_t off, void *host)         \
 {                                                                           \
     uint64_t *ptr = za + off;                                               \
     HOST(host, ptr[BE]);                                                    \
-    HOST(host + 1, ptr[!BE]);                                               \
+    HOST(host + 8, ptr[!BE]);                                               \
 }                                                                           \
 static inline void VNAME##_v_host(void *za, intptr_t off, void *host)       \
 {                                                                           \