[PATCH][next] xen: Replace one-element array with flexible-array member

["Gustavo A. R. Silva" <gustavoars@xxxxxxxxxx>]

One-element arrays are deprecated, and we are replacing them with flexible
array members instead. So, replace one-element array with flexible-array
member in struct xen_page_directory.

This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
routines on memcpy() and help us make progress towards globally
enabling -fstrict-flex-arrays=3 [1].

This results in no differences in binary output.

Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/255
Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1]
Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
---
 drivers/xen/xen-front-pgdir-shbuf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/xen/xen-front-pgdir-shbuf.c 
b/drivers/xen/xen-front-pgdir-shbuf.c
index 5c0b5cb5b419..b52e0fa595a9 100644
--- a/drivers/xen/xen-front-pgdir-shbuf.c
+++ b/drivers/xen/xen-front-pgdir-shbuf.c
@@ -30,7 +30,7 @@
 struct xen_page_directory {
        grant_ref_t gref_dir_next_page;
 #define XEN_GREF_LIST_END      0
-       grant_ref_t gref[1]; /* Variable length */
+       grant_ref_t gref[]; /* Variable length */
 };
 
 /**
-- 
2.34.1