[PATCH] Staging: speakup: don't die if accessing sysfs without synth

[Sasha Levin]

Setting a 'silent' parameter without a synth would crash the kernel.

Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
 drivers/staging/speakup/synth.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/staging/speakup/synth.c b/drivers/staging/speakup/synth.c
index 0b3549b..172cf62 100644
--- a/drivers/staging/speakup/synth.c
+++ b/drivers/staging/speakup/synth.c
@@ -212,6 +212,9 @@ void synth_start(void)
 
 void spk_do_flush(void)
 {
+	if (!synth)
+		return;
+
 	speakup_info.flushing = 1;
 	synth_buffer_clear();
 	if (synth->alive) {
-- 
1.7.10.4

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