[PATCH 2/5] dump: Fix g_array_unref(NULL) in dump-guest-memory

[Markus Armbruster <armbru@redhat.com>]

When dump_init()'s check for non-zero @length fails, dump_cleanup()
passes null s->string_table_buf to g_array_unref(), which spews "GLib:
g_array_unref: assertion 'array' failed" to stderr.

Guard the g_array_unref().

Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 dump/dump.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/dump/dump.c b/dump/dump.c
index a1fad17f9c..d8ea364af2 100644
--- a/dump/dump.c
+++ b/dump/dump.c
@@ -100,7 +100,9 @@ static int dump_cleanup(DumpState *s)
     memory_mapping_list_free(&s->list);
     close(s->fd);
     g_free(s->guest_note);
-    g_array_unref(s->string_table_buf);
+    if (s->string_table_buf) {
+        g_array_unref(s->string_table_buf);
+    }
     s->guest_note = NULL;
     if (s->resume) {
         if (s->detached) {
-- 
2.41.0