gdi32/tests: remove a dead assignment

[Austin English]

-- 
-Austin
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diff --git a/dlls/gdi32/tests/bitmap.c b/dlls/gdi32/tests/bitmap.c
index d0d7a9c..5af3163 100644
--- a/dlls/gdi32/tests/bitmap.c
+++ b/dlls/gdi32/tests/bitmap.c
@@ -279,7 +279,6 @@ static INT DIB_GetWidthBytes( int width, int bpp )
 	case 32: words = width; break;
 
         default:
-            words=0;
             trace("Unknown depth %d, please report.\n", bpp );
             assert(0);
             break;