drivers/staging/speakup: fix indent coding style problem in spk_ttyio.c

This is a patch to the spk_ttyio.c file which fixes up the indent error
reported by the checkpatch.pl tool.

Signed-off-by: Rui Teng <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/speakup/spk_ttyio.c

···
 		return 0;
 
 	/* Make sure the consumer has read buf before we have seen
-         * buf_free == true and overwrite buf */
+	 * buf_free == true and overwrite buf */
 	mb();
 
 	ldisc_data->buf = cp[0];