ixj: make ixj_set_tone_off() static

Signed-off-by: Matthew Martin <lihnucks@gmail.com>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/drivers/telephony/ixj.c b/drivers/telephony/ixj.c
index 5578a9d..f6b2948 100644
--- a/drivers/telephony/ixj.c
+++ b/drivers/telephony/ixj.c
@@ -5712,7 +5712,7 @@
 	return 1;
 }
 
-int ixj_set_tone_off(unsigned short arg, IXJ *j)
+static int ixj_set_tone_off(unsigned short arg, IXJ *j)
 {
 	j->tone_off_time = arg;
 	if (ixj_WriteDSPCommand(0x6E05, j))		/* Set Tone Off Period */