mshtml: call FindMimeFromData with a NULL buffer in ResProtocol_Start

[Austin English]

Fixes http://bugs.winehq.org/show_bug.cgi?id=27115, a regression
introduced by 0825f4b3ff3718752b5f6addd95bc30c10f75d24.

-- 
-Austin
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diff --git a/dlls/mshtml/protocol.c b/dlls/mshtml/protocol.c
index d9a008c..690f607 100644
--- a/dlls/mshtml/protocol.c
+++ b/dlls/mshtml/protocol.c
@@ -683,7 +683,7 @@ static HRESULT WINAPI ResProtocol_Start(IInternetProtocol *iface, LPCWSTR szUrl,
 
     FreeLibrary(hdll);
 
-    hres = FindMimeFromData(NULL, url_file, This->data, This->data_len, NULL, 0, &mime, 0);
+    hres = FindMimeFromData(NULL, url_file, NULL, This->data_len, NULL, 0, &mime, 0);
     heap_free(url);
     if(SUCCEEDED(hres)) {
         IInternetProtocolSink_ReportProgress(pOIProtSink, BINDSTATUS_MIMETYPEAVAILABLE, mime);