video: fbdev: savage: fix memory leak on error handling path in probe

savagefb_probe() calls savage_init_fb_info() that can successfully
allocate memory for info->pixmap.addr but then fail when
fb_alloc_cmap() fails. savagefb_probe() goes to label failed_init and
does not free allocated memory. It is not valid to go to label
failed_mmio since savage_init_fb_info() can fail during memory
allocation as well. So, the patch free allocated memory on the error
handling path in savage_init_fb_info() itself.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Evgeny Novikov <[e-mail]>
Cc: Antonino Daplas <[e-mail]>
Signed-off-by: Bartlomiej Zolnierkiewicz <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/video/fbdev/savage/savagefb_driver.c

···
 			info->flags |= FBINFO_HWACCEL_COPYAREA |
 				       FBINFO_HWACCEL_FILLRECT |
 				       FBINFO_HWACCEL_IMAGEBLIT;
+		else
+			kfree(info->pixmap.addr);
 	}
 #endif
 	return err;