Input: cyapa - fix variable being dereferenced before check

Fixes the warning regarding variable being dereferenced before check
'gen5_pip->resp_len'.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Dudley Du <dudl@cypress.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
diff --git a/drivers/input/mouse/cyapa_gen5.c b/drivers/input/mouse/cyapa_gen5.c
index 9a4a422a..ddf5393 100644
--- a/drivers/input/mouse/cyapa_gen5.c
+++ b/drivers/input/mouse/cyapa_gen5.c
@@ -2557,7 +2557,9 @@
 			 * 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,