[PATCH] tools/libxl: remove usage of VLA arrays

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Clang 19 complains with the following error when building libxl:

libxl_utils.c:48:15: error: variable length array folded to constant array as 
an extension [-Werror,-Wgnu-folding-constant]
   48 |     char path[strlen("/local/domain") + 12];
      |               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

Replace the usage of strlen() with ARRAY_SIZE(), which allows the literal
string length to be known at build time.  Note ARRAY_SIZE() accounts for the
NUL terminator while strlen() didn't, hence subtract 1 from the total size
calculation.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 tools/libs/light/libxl_utils.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/libs/light/libxl_utils.c b/tools/libs/light/libxl_utils.c
index 10398a6c8611..b3f5e751cc3f 100644
--- a/tools/libs/light/libxl_utils.c
+++ b/tools/libs/light/libxl_utils.c
@@ -45,7 +45,7 @@ unsigned long libxl_get_required_shadow_memory(unsigned long 
maxmem_kb, unsigned
 char *libxl_domid_to_name(libxl_ctx *ctx, uint32_t domid)
 {
     unsigned int len;
-    char path[strlen("/local/domain") + 12];
+    char path[ARRAY_SIZE("/local/domain") + 11];
     char *s;
 
     snprintf(path, sizeof(path), "/local/domain/%d/name", domid);
@@ -141,7 +141,7 @@ int libxl_cpupool_qualifier_to_cpupoolid(libxl_ctx *ctx, 
const char *p,
 char *libxl_cpupoolid_to_name(libxl_ctx *ctx, uint32_t poolid)
 {
     unsigned int len;
-    char path[strlen("/local/pool") + 12];
+    char path[ARRAY_SIZE("/local/pool") + 11];
     char *s;
 
     snprintf(path, sizeof(path), "/local/pool/%d/name", poolid);
-- 
2.46.0