drm/ssd130x: fix ssd132x_clear_screen() columns

The number of columns relates to the width, not the height.  Use the
correct variable.

Signed-off-by: John Keeping <[email protected]>
Reviewed-by: Javier Martinez Canillas <[email protected]>
Fixes: fdd591e ("drm/ssd130x: Add support for the SSD132x OLED controller family")
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Javier Martinez Canillas <[email protected]>

Author: johnkeeping

drivers/gpu/drm/solomon/ssd130x.c

@@ -974,7 +974,7 @@ static void ssd130x_clear_screen(struct ssd130x_device *ssd130x, u8 *data_array)
 
 static void ssd132x_clear_screen(struct ssd130x_device *ssd130x, u8 *data_array)
 {
-	unsigned int columns = DIV_ROUND_UP(ssd130x->height, SSD132X_SEGMENT_WIDTH);
+	unsigned int columns = DIV_ROUND_UP(ssd130x->width, SSD132X_SEGMENT_WIDTH);
 	unsigned int height = ssd130x->height;
 
 	memset(data_array, 0, columns * height);