SDL: fix unused variable depending on YUV format

From e4b5afa576ad1d410578158f585881bce770ffe7 Mon Sep 17 00:00:00 2001
From: Ivan Le Lann <[EMAIL REDACTED]>
Date: Sat, 21 May 2022 13:16:12 +0200
Subject: [PATCH] fix unused variable depending on YUV format

---
 src/video/yuv2rgb/yuv_rgb_std_func.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/video/yuv2rgb/yuv_rgb_std_func.h b/src/video/yuv2rgb/yuv_rgb_std_func.h
index f0ab5c66096..94872ec9f56 100644
--- a/src/video/yuv2rgb/yuv_rgb_std_func.h
+++ b/src/video/yuv2rgb/yuv_rgb_std_func.h
@@ -97,10 +97,13 @@ void STD_FUNCTION_NAME(
 	for(y=0; y<(height-(uv_y_sample_interval-1)); y+=uv_y_sample_interval)
 	{
 		const uint8_t *y_ptr1=Y+y*Y_stride,
-			*y_ptr2=Y+(y+1)*Y_stride,
 			*u_ptr=U+(y/uv_y_sample_interval)*UV_stride,
 			*v_ptr=V+(y/uv_y_sample_interval)*UV_stride;
-		
+
+		#if uv_y_sample_interval > 1
+		const uint8_t *y_ptr2=Y+(y+1)*Y_stride;
+		#endif
+
 		uint8_t *rgb_ptr1=RGB+y*RGB_stride;
 
 		#if uv_y_sample_interval > 1
@@ -135,7 +138,9 @@ void STD_FUNCTION_NAME(
 			#endif
 
 			y_ptr1+=2*y_pixel_stride;
+			#if uv_y_sample_interval > 1
 			y_ptr2+=2*y_pixel_stride;
+			#endif
 			u_ptr+=2*uv_pixel_stride/uv_x_sample_interval;
 			v_ptr+=2*uv_pixel_stride/uv_x_sample_interval;
 		}