video: fbdev: efifb: Fix set but not used warning for screen_pitch

screen_pitch was asssigned a value which was never used.
Drop it to fix the warning

Signed-off-by: Sam Ravnborg <[e-mail]>
Acked-by: Thomas Zimmermann <[e-mail]>
Cc: Peter Jones <[e-mail]>
Cc: [e-mail]
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/video/fbdev/efifb.c

···
 
 static void efifb_show_boot_graphics(struct fb_info *info)
 {
-	u32 bmp_width, bmp_height, bmp_pitch, screen_pitch, dst_x, y, src_y;
+	u32 bmp_width, bmp_height, bmp_pitch, dst_x, y, src_y;
 	struct screen_info *si = &screen_info;
 	struct bmp_file_header *file_header;
 	struct bmp_dib_header *dib_header;
···
 	bmp_width = dib_header->width;
 	bmp_height = abs(dib_header->height);
 	bmp_pitch = round_up(3 * bmp_width, 4);
-	screen_pitch = si->lfb_linelength;
 
 	if ((file_header->bitmap_offset + bmp_pitch * bmp_height) >
 				bgrt_image_size)