media: dvb-frontends: cxd2880: return 0 instead of 'ret'.

Since 'ret' is known to be 0, just return '0'. This fixes two smatch warnings:

cxd2880_tnrdmd.c:2165 cxd2880_tnrdmd_check_internal_cpu_status() warn: missing error code? 'ret'
cxd2880_tnrdmd.c:2169 cxd2880_tnrdmd_check_internal_cpu_status() warn: missing error code? 'ret'
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Cc: Yasunari Takiguchi <Yasunari.Takiguchi@sony.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/dvb-frontends/cxd2880/cxd2880_tnrdmd.c

@@ -2162,11 +2162,11 @@ int cxd2880_tnrdmd_check_internal_cpu_status(struct cxd2880_tnrdmd
 		else
 			*task_completed = 0;
 
-		return ret;
+		return 0;
 	}
 	if (cpu_status != 0) {
 		*task_completed = 0;
-		return ret;
+		return 0;
 	}
 
 	ret = cxd2880_tnrdmd_mon_internal_cpu_status_sub(tnr_dmd, &cpu_status);