[DSOUND] add uninitialized check

[Robert Reif]

Add uninitialized check.
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Index: dlls/dsound/dsound.c
===================================================================
RCS file: /home/wine/wine/dlls/dsound/dsound.c,v
retrieving revision 1.42
diff -p -u -r1.42 dsound.c
--- dlls/dsound/dsound.c	19 Oct 2005 19:21:38 -0000	1.42
+++ dlls/dsound/dsound.c	3 Jan 2006 03:39:54 -0000
@@ -584,10 +584,16 @@ static HRESULT WINAPI IDirectSoundImpl_S
     IDirectSoundImpl *This = (IDirectSoundImpl *)iface;
     TRACE("(%p,%p,%s)\n",This,hwnd,dumpCooperativeLevel(level));
 
+    if (This->device == NULL) {
+        WARN("not initialized\n");
+        return DSERR_UNINITIALIZED;
+    }
+
     if (level==DSSCL_PRIORITY || level==DSSCL_EXCLUSIVE) {
         WARN("level=%s not fully supported\n",
              level==DSSCL_PRIORITY ? "DSSCL_PRIORITY" : "DSSCL_EXCLUSIVE");
     }
+
     This->device->priolevel = level;
     return DS_OK;
 }