avifil32: Remove unneeded casts

[Andrew Talbot]

Changelog:
    avifil32: Remove unneeded casts.

diff --git a/dlls/avifil32/api.c b/dlls/avifil32/api.c
index 910c816..465164a 100644
--- a/dlls/avifil32/api.c
+++ b/dlls/avifil32/api.c
@@ -1509,7 +1509,7 @@ BOOL WINAPI AVISaveOptions(HWND hWnd, UINT uFlags, INT nStreams,
     HeapFree(GetProcessHeap(), 0, pSavedOptions);
   }
 
-  return (BOOL)ret;
+  return ret;
 }
 
 /***********************************************************************
diff --git a/dlls/avifil32/avifile.c b/dlls/avifil32/avifile.c
index a23e326..b97fd78 100644
--- a/dlls/avifil32/avifile.c
+++ b/dlls/avifil32/avifile.c
@@ -1795,7 +1795,7 @@ static HRESULT AVIFILE_LoadFile(IAVIFileImpl *This)
 	    if (str == NULL)
 	      return AVIERR_MEMORY;
 
-	    if (mmioRead(This->hmmio, (HPSTR)str, ck.cksize) != ck.cksize)
+	    if (mmioRead(This->hmmio, str, ck.cksize) != ck.cksize)
 	    {
 	      HeapFree(GetProcessHeap(), 0, str);
 	      return AVIERR_FILEREAD;
@@ -2249,7 +2249,7 @@ static HRESULT AVIFILE_SaveFile(IAVIFileImpl *This)
       WideCharToMultiByte(CP_ACP, 0, pStream->sInfo.szName, -1, str,
 			  ck.cksize, NULL, NULL);
 
-      if (mmioWrite(This->hmmio, (HPSTR)str, ck.cksize) != ck.cksize) {
+      if (mmioWrite(This->hmmio, str, ck.cksize) != ck.cksize) {
 	HeapFree(GetProcessHeap(), 0, str);	
 	return AVIERR_FILEWRITE;
       }
diff --git a/dlls/avifil32/factory.c b/dlls/avifil32/factory.c
index ae717c8..40e4c68 100644
--- a/dlls/avifil32/factory.c
+++ b/dlls/avifil32/factory.c
@@ -209,7 +209,7 @@ BOOL WINAPI DllMain(HINSTANCE hInstDll, DWORD fdwReason, LPVOID lpvReserved)
   switch (fdwReason) {
   case DLL_PROCESS_ATTACH:
     DisableThreadLibraryCalls(hInstDll);
-    AVIFILE_hModule = (HMODULE)hInstDll;
+    AVIFILE_hModule = hInstDll;
     break;
   case DLL_PROCESS_DETACH:
     break;