[PATCH v4 3/5] quartz: Fix error code on empty filename.

[Alfred Agrell]

From: Alfred Agrell

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=56491
---
 dlls/quartz/filtergraph.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dlls/quartz/filtergraph.c b/dlls/quartz/filtergraph.c
index f2c44498109..995c77d89b9 100644
--- a/dlls/quartz/filtergraph.c
+++ b/dlls/quartz/filtergraph.c
@@ -1516,6 +1516,9 @@ static HRESULT WINAPI FilterGraph2_AddSourceFilter(IFilterGraph2 *iface,
     TRACE("graph %p, filename %s, filter_name %s, ret_filter %p.\n",
             graph, debugstr_w(filename), debugstr_w(filter_name), ret_filter);

+    if (!*filename)
+        return VFW_E_NOT_FOUND;
+
     if (!get_media_type(filename, NULL, NULL, &clsid))
         clsid = CLSID_AsyncReader;
     TRACE("Using source filter %s.\n", debugstr_guid(&clsid));