gpu: ipu-v3: image-convert: use swap()

Use swap() instead of implementing it since it makes code cleaner.

Signed-off-by: Salah Triki <[e-mail]>
Link: https://lore.kernel.org/r/20210713140521.GA1873885@pc
[[e-mail]: add "image-convert:" prefix to commit description]
Signed-off-by: Philipp Zabel <[e-mail]>

drivers/gpu/ipu-v3/ipu-image-convert.c

···
 	const struct ipu_image_pixfmt *fmt = image->fmt;
 	unsigned int row, col, tile = 0;
 	u32 H, top, y_stride, uv_stride;
-	u32 uv_row_off, uv_col_off, uv_off, u_off, v_off, tmp;
+	u32 uv_row_off, uv_col_off, uv_off, u_off, v_off;
 	u32 y_row_off, y_col_off, y_off;
 	u32 y_size, uv_size;
 
···
 
 			u_off = y_size - y_off + uv_off;
 			v_off = (fmt->uv_packed) ? 0 : u_off + uv_size;
-			if (fmt->uv_swapped) {
-				tmp = u_off;
-				u_off = v_off;
-				v_off = tmp;
-			}
+			if (fmt->uv_swapped)
+				swap(u_off, v_off);
 
 			image->tile[tile].offset = y_off;
 			image->tile[tile].u_off = u_off;