zink: don't assert geometryShader for IMG proprietary driver

The proprietary driver for Imagination Rogue-architecture GPUs does not
come with geometryShader support.

Change the assert for it to another if condition.

Signed-off-by: Icenowy Zheng <uwu@icenowy.me>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34183>

src/gallium/drivers/zink/zink_screen.c

@@ -2845,10 +2845,9 @@ init_driver_workarounds(struct zink_screen *screen)
    }
 
    if (zink_driverid(screen) ==
-       VK_DRIVER_ID_IMAGINATION_PROPRIETARY) {
-      assert(screen->info.feats.features.geometryShader);
+       VK_DRIVER_ID_IMAGINATION_PROPRIETARY &&
+       screen->info.feats.features.geometryShader)
       screen->driver_workarounds.no_linesmooth = true;
-   }
 
    /* This is a workarround for the lack of
     * gl_PointSize + glPolygonMode(..., GL_LINE), in the imagination