Staging: speakup/speakup_acntpc: Return NULL instead of 0

The function returns a pointer. Hence return NULL instead of 0.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/speakup/speakup_acntpc.c b/drivers/staging/speakup/speakup_acntpc.c
index 87a508d..80141ac 100644
--- a/drivers/staging/speakup/speakup_acntpc.c
+++ b/drivers/staging/speakup/speakup_acntpc.c
@@ -166,7 +166,7 @@
 		outb_p(ch, speakup_info.port_tts);
 		buf++;
 	}
-	return 0;
+	return NULL;
 }
 
 static void do_catch_up(struct spk_synth *synth)