c/r: initialize migrate_opts properly

The commit "c/r: add support for CRIU's --action-script" breaks
lxc-checkpoint on the command-line. It produces errors like:

 sh: $'\260\366\b\001': command not found

and then it fails. src/lxc/criu.c expects migrate_opts->action_script to
be either NULL, then it is ignored, or to actually contain the name of
an action scripts.

As the struct migrate_opts has not static storage is has to be explicitly
initialized or the value of the structure's members is indeterminate.

Signed-off-by: Adrian Reber <areber@redhat.com>

src/lxc/lxccontainer.c

@@ -3988,11 +3988,13 @@ WRAP_API_3(int, lxcapi_migrate, unsigned int, struct migrate_opts *, unsigned in
 
 static bool do_lxcapi_checkpoint(struct lxc_container *c, char *directory, bool stop, bool verbose)
 {
-	struct migrate_opts opts = {
-		.directory = directory,
-		.stop = stop,
-		.verbose = verbose,
-	};
+	struct migrate_opts opts;
+
+	memset(&opts, 0, sizeof(opts));
+
+	opts.directory = directory;
+	opts.stop = stop;
+	opts.verbose = verbose;
 
 	return !do_lxcapi_migrate(c, MIGRATE_DUMP, &opts, sizeof(opts));
 }
@@ -4001,10 +4003,12 @@ WRAP_API_3(bool, lxcapi_checkpoint, char *, bool, bool)
 
 static bool do_lxcapi_restore(struct lxc_container *c, char *directory, bool verbose)
 {
-	struct migrate_opts opts = {
-		.directory = directory,
-		.verbose = verbose,
-	};
+	struct migrate_opts opts;
+
+	memset(&opts, 0, sizeof(opts));
+
+	opts.directory = directory;
+	opts.verbose = verbose;
 
 	return !do_lxcapi_migrate(c, MIGRATE_RESTORE, &opts, sizeof(opts));
 }