windowscodecs: Avoid redundant checks when reading a TIFF tile.

dlls/windowscodecs/tiffformat.c

@@ -974,34 +974,25 @@ static HRESULT WINAPI TiffFrameDecode_CopyPalette(IWICBitmapFrameDecode *iface,
 
 static HRESULT TiffFrameDecode_ReadTile(TiffFrameDecode *This, UINT tile_x, UINT tile_y)
 {
-    HRESULT hr=S_OK;
     tsize_t ret;
     int swap_bytes;
 
     swap_bytes = pTIFFIsByteSwapped(This->parent->tiff);
 
     ret = pTIFFSetDirectory(This->parent->tiff, This->index);
-
     if (ret == -1)
-        hr = E_FAIL;
+        return E_FAIL;
 
-    if (hr == S_OK)
-    {
-        if (This->decode_info.tiled)
-        {
-            ret = pTIFFReadEncodedTile(This->parent->tiff, tile_x + tile_y * This->decode_info.tiles_across, This->cached_tile, This->decode_info.tile_size);
-        }
-        else
-        {
-            ret = pTIFFReadEncodedStrip(This->parent->tiff, tile_y, This->cached_tile, This->decode_info.tile_size);
-        }
+    if (This->decode_info.tiled)
+        ret = pTIFFReadEncodedTile(This->parent->tiff, tile_x + tile_y * This->decode_info.tiles_across, This->cached_tile, This->decode_info.tile_size);
+    else
+        ret = pTIFFReadEncodedStrip(This->parent->tiff, tile_y, This->cached_tile, This->decode_info.tile_size);
 
-        if (ret == -1)
-            hr = E_FAIL;
-    }
+    if (ret == -1)
+        return E_FAIL;
 
     /* 8bpp grayscale with extra alpha */
-    if (hr == S_OK && This->decode_info.source_bpp == 16 && This->decode_info.samples == 2 && This->decode_info.bpp == 32)
+    if (This->decode_info.source_bpp == 16 && This->decode_info.samples == 2 && This->decode_info.bpp == 32)
     {
         BYTE *src;
         DWORD *dst, count = This->decode_info.tile_width * This->decode_info.tile_height;
@@ -1016,7 +1007,7 @@ static HRESULT TiffFrameDecode_ReadTile(TiffFrameDecode *This, UINT tile_x, UINT
         }
     }
 
-    if (hr == S_OK && This->decode_info.reverse_bgr)
+    if (This->decode_info.reverse_bgr)
     {
         if (This->decode_info.bps == 8)
         {
@@ -1027,7 +1018,7 @@ static HRESULT TiffFrameDecode_ReadTile(TiffFrameDecode *This, UINT tile_x, UINT
         }
     }
 
-    if (hr == S_OK && swap_bytes && This->decode_info.bps > 8)
+    if (swap_bytes && This->decode_info.bps > 8)
     {
         UINT row, i, samples_per_row;
         BYTE *sample, temp;
@@ -1055,7 +1046,7 @@ static HRESULT TiffFrameDecode_ReadTile(TiffFrameDecode *This, UINT tile_x, UINT
         }
     }
 
-    if (hr == S_OK && This->decode_info.invert_grayscale)
+    if (This->decode_info.invert_grayscale)
     {
         BYTE *byte, *end;
 
@@ -1071,13 +1062,10 @@ static HRESULT TiffFrameDecode_ReadTile(TiffFrameDecode *This, UINT tile_x, UINT
             *byte = ~(*byte);
     }
 
-    if (hr == S_OK)
-    {
-        This->cached_tile_x = tile_x;
-        This->cached_tile_y = tile_y;
-    }
+    This->cached_tile_x = tile_x;
+    This->cached_tile_y = tile_y;
 
-    return hr;
+    return S_OK;
 }
 
 static HRESULT WINAPI TiffFrameDecode_CopyPixels(IWICBitmapFrameDecode *iface,