added new line symbol after warning about dropped messages

so this message will not mess with the next one

Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Maxim Akristiniy <maksim.akristiniy@yotadevices.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>

kernel/printk/printk.c

@@ -2190,7 +2190,7 @@ void console_unlock(void)
 		}
 
 		if (console_seq < log_first_seq) {
-			len = sprintf(text, "** %u printk messages dropped ** ",
+			len = sprintf(text, "** %u printk messages dropped **\n",
 				      (unsigned)(log_first_seq - console_seq));
 
 			/* messages are gone, move to first one */