[PATCH RESEND] media: dst_ca: Add error handling for dst_comm_init()

[Wentao Liang <vulab@iscas.ac.cn>]

The function dst_ci_command() calls the function dst_comm_init()
but does not handle the error if the init fails. A proper implementation
can be found in dst_command() in /source/drivers/media/pci/bt8xx/dst.c.

Add error handling to the dst_comm_init(). Print an error message via
dprintk(), and jump to the 'error' label if the function fails.

Fixes: 50b215a05878 ("[PATCH] dvb: DST: reorganize Twinhan DST driver to support CI")
Cc: stable@vger.kernel.org # v2.6+
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
---
 drivers/media/pci/bt8xx/dst_ca.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/media/pci/bt8xx/dst_ca.c b/drivers/media/pci/bt8xx/dst_ca.c
index a9cc6e7a57f9..a743f7653fdd 100644
--- a/drivers/media/pci/bt8xx/dst_ca.c
+++ b/drivers/media/pci/bt8xx/dst_ca.c
@@ -66,7 +66,10 @@ static int dst_ci_command(struct dst_state* state, u8 * data, u8 *ca_string, u8
 	u8 reply;
 
 	mutex_lock(&state->dst_mutex);
-	dst_comm_init(state);
+	if (dst_comm_init(state) < 0) {
+		dprintk(verbose, DST_CA_ERROR, 1, "DST initialization failed.");
+		goto error;
+	}
 	msleep(65);
 
 	if (write_dst(state, data, len)) {
-- 
2.42.0.windows.2