msctf: Remove superfluous casts.

dlls/msctf/compartmentmgr.c

@@ -617,7 +617,7 @@ static HRESULT WINAPI CompartmentSource_UnadviseSink(ITfSource *iface, DWORD pdw
     if (get_Cookie_magic(pdwCookie)!=COOKIE_MAGIC_COMPARTMENTSINK)
         return E_INVALIDARG;
 
-    sink = (CompartmentSink*)remove_Cookie(pdwCookie);
+    sink = remove_Cookie(pdwCookie);
     if (!sink)
         return CONNECT_E_NOCONNECTION;
 

dlls/msctf/context.c

@@ -642,7 +642,7 @@ static HRESULT WINAPI ContextSource_UnadviseSink(ITfSource *iface, DWORD pdwCook
     if (get_Cookie_magic(pdwCookie)!=COOKIE_MAGIC_CONTEXTSINK)
         return E_INVALIDARG;
 
-    sink = (ContextSink*)remove_Cookie(pdwCookie);
+    sink = remove_Cookie(pdwCookie);
     if (!sink)
         return CONNECT_E_NOCONNECTION;
 

dlls/msctf/inputprocessor.c

@@ -739,7 +739,7 @@ static HRESULT WINAPI IPPSource_UnadviseSink(ITfSource *iface, DWORD pdwCookie)
     if (get_Cookie_magic(pdwCookie)!=COOKIE_MAGIC_IPPSINK)
         return E_INVALIDARG;
 
-    sink = (InputProcessorProfilesSink*)remove_Cookie(pdwCookie);
+    sink = remove_Cookie(pdwCookie);
     if (!sink)
         return CONNECT_E_NOCONNECTION;
 

dlls/msctf/threadmgr.c

@@ -662,7 +662,7 @@ static HRESULT WINAPI ThreadMgrSource_UnadviseSink(ITfSource *iface, DWORD pdwCo
     if (get_Cookie_magic(pdwCookie)!=COOKIE_MAGIC_TMSINK)
         return E_INVALIDARG;
 
-    sink = (ThreadMgrSink*)remove_Cookie(pdwCookie);
+    sink = remove_Cookie(pdwCookie);
     if (!sink)
         return CONNECT_E_NOCONNECTION;