staging: speakup: Prefix externally-visible symbols

This prefixes all externally-visible symbols of speakup with "spk_".

Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/speakup/speakup_txprt.c b/drivers/staging/speakup/speakup_txprt.c
index 5d5bf7c..5a29b9f 100644
--- a/drivers/staging/speakup/speakup_txprt.c
+++ b/drivers/staging/speakup/speakup_txprt.c
@@ -100,7 +100,7 @@
 	.startup = SYNTH_START,
 	.checkval = SYNTH_CHECK,
 	.vars = vars,
-	.probe = serial_synth_probe,
+	.probe = spk_serial_synth_probe,
 	.release = spk_serial_release,
 	.synth_immediate = spk_synth_immediate,
 	.catch_up = spk_do_catch_up,