PM: hibernate: fix spelling mistake "shapshot" -> "snapshot"

There is a spelling mistake in a pr_info message. Fix it.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

kernel/power/snapshot.c

@@ -1841,7 +1841,7 @@ int hibernate_preallocate_memory(void)
 
  out:
 	stop = ktime_get();
-	pr_info("Allocated %lu pages for shapshot\n", pages);
+	pr_info("Allocated %lu pages for snapshot\n", pages);
 	swsusp_show_speed(start, stop, pages, "Allocated");
 
 	return 0;