drm/ssd130x: ensure ssd132x pitch is correct

The bounding rectangle is adjusted to ensure it aligns to
SSD132X_SEGMENT_WIDTH, which may adjust the pitch. Calculate the pitch
after aligning the left and right edge.

Fixes: fdd591e00a9c ("drm/ssd130x: Add support for the SSD132x OLED controller family")
Signed-off-by: John Keeping <[e-mail]>
Reviewed-by: Javier Martinez Canillas <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]
Signed-off-by: Javier Martinez Canillas <[e-mail]>

drivers/gpu/drm/solomon/ssd130x.c

···
 				struct drm_format_conv_state *fmtcnv_state)
 {
 	struct ssd130x_device *ssd130x = drm_to_ssd130x(fb->dev);
-	unsigned int dst_pitch = drm_rect_width(rect);
+	unsigned int dst_pitch;
 	struct iosys_map dst;
 	int ret = 0;
 
···
 	rect->x1 = round_down(rect->x1, SSD132X_SEGMENT_WIDTH);
 	rect->x2 = min_t(unsigned int, round_up(rect->x2, SSD132X_SEGMENT_WIDTH),
 			 ssd130x->width);
+
+	dst_pitch = drm_rect_width(rect);
 
 	ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
 	if (ret)