[PATCH v4 1/3] winegstreamer: Allow NULL for time_format.

[Brendan McGrath]

From: Brendan McGrath

Allow the value of pguidTimeFormat to be NULL on a call to
IMFMediaSource::Start. Currently, if NULL is used, Wine crashes with
a SIGSEGV.

MS documentation states:
This parameter can be NULL. If the value is NULL, it is equivalent to GUID_NULL.

https://learn.microsoft.com/en-us/windows/win32/api/mfidl/nf-mfidl-imfmedias...
---
 dlls/winegstreamer/media_source.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dlls/winegstreamer/media_source.c b/dlls/winegstreamer/media_source.c
index 88056b27c5d..ab842b3e438 100644
--- a/dlls/winegstreamer/media_source.c
+++ b/dlls/winegstreamer/media_source.c
@@ -1552,6 +1552,9 @@ static HRESULT WINAPI media_source_Start(IMFMediaSource *iface, IMFPresentationD

TRACE("%p, %p, %p, %p.\n", iface, descriptor, time_format, position);

+    if (!time_format)
+        time_format = &GUID_NULL;
+
     EnterCriticalSection(&source->cs);

if (source->state == SOURCE_SHUTDOWN)