fbdev: imsttfb: fix double free in probe()

The init_imstt() function calls framebuffer_release() on error and then
the probe() function calls it again.  It should only be done in probe.

Fixes: 518ecb6a ("fbdev: imsttfb: Fix error path of imsttfb_probe()")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Helge Deller <deller@gmx.de>

drivers/video/fbdev/imsttfb.c

@@ -1421,7 +1421,6 @@ static int init_imstt(struct fb_info *info)
 	if ((info->var.xres * info->var.yres) * (info->var.bits_per_pixel >> 3) > info->fix.smem_len
 	    || !(compute_imstt_regvals(par, info->var.xres, info->var.yres))) {
 		printk("imsttfb: %ux%ux%u not supported\n", info->var.xres, info->var.yres, info->var.bits_per_pixel);
-		framebuffer_release(info);
 		return -ENODEV;
 	}
 
@@ -1453,14 +1452,11 @@ static int init_imstt(struct fb_info *info)
 	              FBINFO_HWACCEL_FILLRECT |
 	              FBINFO_HWACCEL_YPAN;
 
-	if (fb_alloc_cmap(&info->cmap, 0, 0)) {
-		framebuffer_release(info);
+	if (fb_alloc_cmap(&info->cmap, 0, 0))
 		return -ENODEV;
-	}
 
 	if (register_framebuffer(info) < 0) {
 		fb_dealloc_cmap(&info->cmap);
-		framebuffer_release(info);
 		return -ENODEV;
 	}