ffmpeg crash

diff --git a/libavdevice/dshow.c b/libavdevice/dshow.c
index d7f5bd7..afd8cef 100644
--- a/libavdevice/dshow.c
+++ b/libavdevice/dshow.c
@@ -716,9 +716,9 @@ dshow_list_device_options(AVFormatContext *avctx, ICreateDevEnum *devenum,
     if ((r = dshow_cycle_devices(avctx, devenum, devtype, sourcetype, &device_filter, &device_unique_name)) < 0)
         return r;
     ctx->device_filter[devtype] = device_filter;
+    ctx->device_unique_name[devtype] = device_unique_name;
     if ((r = dshow_cycle_pins(avctx, devtype, sourcetype, device_filter, NULL)) < 0)
         return r;
-    av_freep(&device_unique_name);
     return 0;
 }

diff --git a/libavdevice/dshow_capture.h b/libavdevice/dshow_capture.h