qemu: do not leak the directory in virQEMUDriverConfigLoadMemoryEntry

virConfGetValueString returns an allocated string that needs to be
freed.

Fixes: 34a59fb5Signed-off-by: NJán Tomko <jtomko@redhat.com>
Reviewed-by: NDaniel Henrique Barboza <danielhb413@gmail.com>

src/qemu/qemu_conf.c

@@ -969,7 +969,7 @@ static int
 virQEMUDriverConfigLoadMemoryEntry(virQEMUDriverConfigPtr cfg,
                                    virConfPtr conf)
 {
-    char *dir = NULL;
+    g_autofree char *dir = NULL;
     int rc;
 
     if ((rc = virConfGetValueString(conf, "memory_backing_dir", &dir)) < 0) {