drm/gma500: fix repeated words in comments

Delete the redundant word 'for'.
Signed-off-by: NJilin Yuan <yuanjilin@cdjrlc.com>
Signed-off-by: NPatrik Jakobsson <patrik.r.jakobsson@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220907113927.35305-1-yuanjilin@cdjrlc.com

drivers/gpu/drm/gma500/oaktrail_crtc.c

@@ -310,7 +310,7 @@ static void oaktrail_crtc_dpms(struct drm_crtc *crtc, int mode)
 						   temp & ~PIPEACONF_ENABLE, i);
 				REG_READ_WITH_AUX(map->conf, i);
 			}
-			/* Wait for for the pipe disable to take effect. */
+			/* Wait for the pipe disable to take effect. */
 			gma_wait_for_vblank(dev);
 
 			temp = REG_READ_WITH_AUX(map->dpll, i);