lguest: fix switcher_page leak on unload

map_switcher allocates the array, unmap_switcher has to free it
accordingly.

Signed-off-by: Johannes Weiner <[e-mail]>
Signed-off-by: Rusty Russell <[e-mail]>

drivers/lguest/core.c

···
 	/* Now we just need to free the pages we copied the switcher into */
 	for (i = 0; i < TOTAL_SWITCHER_PAGES; i++)
 		__free_pages(switcher_page[i], 0);
+	kfree(switcher_page);
 }
 
 /*H:032