st/dri: remove trailing whitespace

Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
diff --git a/src/gallium/state_trackers/dri/dri_screen.c b/src/gallium/state_trackers/dri/dri_screen.c
index aa0ad09..a950f52 100644
--- a/src/gallium/state_trackers/dri/dri_screen.c
+++ b/src/gallium/state_trackers/dri/dri_screen.c
@@ -143,7 +143,7 @@
       stencil_bits_array[0] = 0;
       depth_buffer_factor = 1;
    }
- 
+
    msaa_samples_max = (screen->st_api->feature_mask & ST_API_FEATURE_MS_VISUALS_MASK)
       ? MSAA_VISUAL_MAX_SAMPLES : 1;