qemu: Avoid NULL dereference in qemuSharedDiskEntryFree

At least one caller may call qemuSharedDiskEntryFree with NULL as the
first argument. Let's make the function similar to other *Free functions
and do nothing in such case.

diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c
index 3ef3499bbd9fb210a7d7b0f505f7d069b9fabced..24086105f71f769e9e3a2e3146d7b35c8012ce00 100644 (file)
--- a/src/qemu/qemu_conf.c
+++ b/src/qemu/qemu_conf.c
@@ -1045,6 +1045,9 @@ qemuSharedDiskEntryFree(void *payload, const void *name ATTRIBUTE_UNUSED)
     qemuSharedDiskEntryPtr entry = payload;
     size_t i;
 
+    if (!entry)
+        return;
+
     for (i = 0; i < entry->ref; i++) {
         VIR_FREE(entry->domains[i]);
     }