winemenubuilder: initialize a variable

[Austin English]

Clang warns here, we'd try to free urlPath in cleanup in the
desktop/start menu directory check failure case.

--
-Austin
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diff --git a/programs/winemenubuilder/winemenubuilder.c b/programs/winemenubuilder/winemenubuilder.c
index 9c81ab8..973bd02 100644
--- a/programs/winemenubuilder/winemenubuilder.c
+++ b/programs/winemenubuilder/winemenubuilder.c
@@ -3013,7 +3013,7 @@ static BOOL InvokeShellLinkerForURL( IUniformResourceLocatorW *url, LPCWSTR link
 {
     char *link_name = NULL, *icon_name = NULL;
     DWORD csidl = -1;
-    LPWSTR urlPath;
+    LPWSTR urlPath = NULL;
     char *escaped_urlPath = NULL;
     HRESULT hr;
     HANDLE hSem = NULL;