fusion: Use proper function pointer

[Andrew Talbot]

Changelog:
    fusion: Use proper function pointer.

diff --git a/dlls/fusion/fusion.c b/dlls/fusion/fusion.c
index ac01cf4..637346c 100644
--- a/dlls/fusion/fusion.c
+++ b/dlls/fusion/fusion.c
@@ -32,6 +32,9 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(fusion);
 
+typedef HRESULT (WINAPI *PFNGETCORVERSION)(LPWSTR pbuffer, DWORD cchBuffer,
+                                           DWORD *dwLength);
+
 /******************************************************************
  *  ClearDownloadCache   (FUSION.@)
  */
@@ -89,20 +92,18 @@ HRESULT WINAPI GetAssemblyIdentityFromFile(LPCWSTR pwzFilePath, REFIID riid,
     return E_NOTIMPL;
 }
 
-static HRESULT (WINAPI *pGetCORVersion)(LPWSTR pbuffer, DWORD cchBuffer,
-                                        DWORD *dwLength);
-
 static HRESULT get_corversion(LPWSTR version, DWORD size)
 {
     HMODULE hmscoree;
     HRESULT hr;
     DWORD len;
+    PFNGETCORVERSION pGetCORVersion;
 
     hmscoree = LoadLibraryA("mscoree.dll");
     if (!hmscoree)
         return E_FAIL;
 
-    pGetCORVersion = (void *)GetProcAddress(hmscoree, "GetCORVersion");
+    pGetCORVersion = (PFNGETCORVERSION)GetProcAddress(hmscoree, "GetCORVersion");
     if (!pGetCORVersion)
         return E_FAIL;