wined3d: Clear reg_maps in shader_get_registers_used() instead of the callers.

dlls/wined3d/baseshader.c

@@ -556,8 +556,7 @@ HRESULT shader_get_registers_used(IWineD3DBaseShader *iface, struct shader_reg_m
 
     /* There are some minor differences between pixel and vertex shaders */
 
-    memset(reg_maps->bumpmat, 0, sizeof(reg_maps->bumpmat));
-    memset(reg_maps->luminanceparams, 0, sizeof(reg_maps->luminanceparams));
+    memset(reg_maps, 0, sizeof(*reg_maps));
 
     /* get_registers_used is called on every compile on some 1.x shaders, which can result
      * in stacking up a collection of local constants. Delete the old constants if existing

dlls/wined3d/pixelshader.c

@@ -314,7 +314,6 @@ static HRESULT WINAPI IWineD3DPixelShaderImpl_SetFunction(IWineD3DPixelShader *i
     list_init(&This->baseShader.constantsI);
 
     /* Second pass: figure out which registers are used, what the semantics are, etc.. */
-    memset(reg_maps, 0, sizeof(shader_reg_maps));
     hr = shader_get_registers_used((IWineD3DBaseShader *)This, reg_maps, This->semantics_in, NULL, pFunction);
     if (FAILED(hr)) return hr;
 

dlls/wined3d/vertexshader.c

@@ -329,7 +329,6 @@ static HRESULT WINAPI IWineD3DVertexShaderImpl_SetFunction(IWineD3DVertexShader
     /* Second pass: figure out registers used, semantics, etc.. */
     This->min_rel_offset = GL_LIMITS(vshader_constantsF);
     This->max_rel_offset = 0;
-    memset(reg_maps, 0, sizeof(shader_reg_maps));
     hr = shader_get_registers_used((IWineD3DBaseShader*) This, reg_maps,
             This->semantics_in, This->semantics_out, pFunction);
     if (hr != WINED3D_OK) return hr;