[PATCH] gdbstub: Fix SEGFAULT in find_cpu_clusters()

[Nikita Shubin]

From: Nikita Shubin <n.shubin@yadro.com>

target_xml is a dynamic GString, use NULL to initialize it.

Fixes: 56e534bd11 ("gdbstub: refactor get_feature_xml")

Signed-off-by: Nikita Shubin <n.shubin@yadro.com>
---
Observed with:
build-qemu/qemu-system-riscv64 -M sifive_u -bios none -nographic -s
Segmentation fault
---
 gdbstub/softmmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gdbstub/softmmu.c b/gdbstub/softmmu.c
index 9f0b8b5497..42645d2220 100644
--- a/gdbstub/softmmu.c
+++ b/gdbstub/softmmu.c
@@ -292,7 +292,7 @@ static int find_cpu_clusters(Object *child, void *opaque)
         assert(cluster->cluster_id != UINT32_MAX);
         process->pid = cluster->cluster_id + 1;
         process->attached = false;
-        process->target_xml[0] = '\0';
+        process->target_xml = NULL;
 
         return 0;
     }
-- 
2.39.2