printk: fix typo in printk_safe.c

Link: http://lkml.kernel.org/r/1508682655-27293-1-git-send-email-bhe@redhat.com
Cc: rostedt@goodmis.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Baoquan He <bhe@redhat.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>

kernel/printk/printk_safe.c

@@ -75,7 +75,7 @@ static void queue_flush_work(struct printk_safe_seq_buf *s)
  * have dedicated buffers, because otherwise printk-safe preempted by
  * NMI-printk would have overwritten the NMI messages.
  *
- * The messages are fushed from irq work (or from panic()), possibly,
+ * The messages are flushed from irq work (or from panic()), possibly,
  * from other CPU, concurrently with printk_safe_log_store(). Should this
  * happen, printk_safe_log_store() will notice the buffer->len mismatch
  * and repeat the write.