winefile: Fix collapsing when there's no parent directory

[André Hentschel]

Fixes a crash when you are at / (unix fs) and double click ..
---
 programs/winefile/winefile.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/programs/winefile/winefile.c b/programs/winefile/winefile.c
index 63ce463..afb73fe 100644
--- a/programs/winefile/winefile.c
+++ b/programs/winefile/winefile.c
@@ -3563,9 +3563,13 @@ static BOOL expand_entry(ChildWnd* child, Entry* dir)
 
 static void collapse_entry(Pane* pane, Entry* dir)
 {
-	int idx = SendMessageW(pane->hwnd, LB_FINDSTRING, 0, (LPARAM)dir);
+    int idx;
 
-	ShowWindow(pane->hwnd, SW_HIDE);
+    if (!dir)
+        return;
+
+    idx = SendMessageW(pane->hwnd, LB_FINDSTRING, 0, (LPARAM)dir);
+    ShowWindow(pane->hwnd, SW_HIDE);
 
 	/* hide sub entries */
 	for(;;) {
-- 

Best Regards, André Hentschel
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