[PATCH] winealsa.drv: Don't crash when getting NULL event from midi

[Fabian Maurer]

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=46170
Signed-off-by: Fabian Maurer <dark.shadow4 at web.de>
---
 dlls/winealsa.drv/midi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/dlls/winealsa.drv/midi.c b/dlls/winealsa.drv/midi.c
index 3d4d933ead..a594f5af70 100644
--- a/dlls/winealsa.drv/midi.c
+++ b/dlls/winealsa.drv/midi.c
@@ -328,6 +328,10 @@ static DWORD WINAPI midRecThread(LPVOID arg)
             EnterCriticalSection(&midiSeqLock);
 	    snd_seq_event_input(midiSeq, &ev);
             LeaveCriticalSection(&midiSeqLock);
+
+            if (!ev)
+                continue;
+
 	    /* Find the target device */
 	    for (wDevID = 0; wDevID < MIDM_NumDevs; wDevID++)
 		if ( (ev->source.client == MidiInDev[wDevID].addr.client) && (ev->source.port == MidiInDev[wDevID].addr.port) )
-- 
2.19.1