wined3d: Add some 'fall through' comments (coverity)

[Frédéric Delanoy]

CIDs 744973-744974
---
 dlls/wined3d/glsl_shader.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/dlls/wined3d/glsl_shader.c b/dlls/wined3d/glsl_shader.c
index 9490552..3cac7d8 100644
--- a/dlls/wined3d/glsl_shader.c
+++ b/dlls/wined3d/glsl_shader.c
@@ -5126,8 +5126,10 @@ static GLuint shader_glsl_generate_ffp_fragment_shader(struct wined3d_shader_buf
         {
             case WINED3D_TOP_BUMPENVMAP_LUMINANCE:
                 lum_map |= 1 << stage;
+                /* fall through */
             case WINED3D_TOP_BUMPENVMAP:
                 bump_map |= 1 << stage;
+                /* fall through */
             case WINED3D_TOP_BLEND_TEXTURE_ALPHA:
             case WINED3D_TOP_BLEND_TEXTURE_ALPHA_PM:
                 tex_map |= 1 << stage;
-- 
1.8.0