[PATCH 2/2] input: cyapa: fix variable dereferenced before check 'gen5_pip->resp_len' issue

[Dudley Du]

Fixes the warning issue of the variable dereferenced before check
'gen5_pip->resp_len' report by dan Carpenter.

Signed-off-by: Dudley Du <dudl@xxxxxxxxxxx>
---
 drivers/input/mouse/cyapa_gen5.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/input/mouse/cyapa_gen5.c b/drivers/input/mouse/cyapa_gen5.c
index 69d9059..ed1af74 100644
--- a/drivers/input/mouse/cyapa_gen5.c
+++ b/drivers/input/mouse/cyapa_gen5.c
@@ -2558,7 +2558,9 @@ static bool cyapa_gen5_irq_cmd_handler(struct cyapa *cyapa)
 			 * trackpad device when booting/rebooting
 			 * their chrome book.
 			 */
-			length = *gen5_pip->resp_len;
+			length = 0;
+			if (gen5_pip->resp_len)
+				length = *gen5_pip->resp_len;
 			cyapa_empty_pip_output_data(cyapa,
 					gen5_pip->resp_data,
 					&length,
-- 
1.9.1

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