mesa: update assertion in detach_shader() for geom shaders

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=74723
Cc: "10.0" "10.1" <mesa-stable@lists.freedesktop.org>
Tested-by: Andreas Boll <andreas.boll.dev@gmail.com>

src/mesa/main/shaderapi.c

@@ -404,6 +404,7 @@ detach_shader(struct gl_context *ctx, GLuint program, GLuint shader)
          {
             for (j = 0; j < shProg->NumShaders; j++) {
                assert(shProg->Shaders[j]->Type == GL_VERTEX_SHADER ||
+                      shProg->Shaders[j]->Type == GL_GEOMETRY_SHADER ||
                       shProg->Shaders[j]->Type == GL_FRAGMENT_SHADER);
                assert(shProg->Shaders[j]->RefCount > 0);
             }