media: mb86a16: be more resilient if I2C fails on sync

If the I2C read fails while check for sync, there's no point
on doing adjusting the tuner due to a random value that might
be at VIRM var. So, set VIRM to zero, as that makes the caller
for check_sync() to return an error.

Fix those smatch warnings:
	drivers/media/dvb-frontends/mb86a16.c:1460 mb86a16_set_fe() error: uninitialized symbol 'VIRM'.
	drivers/media/dvb-frontends/mb86a16.c:1461 mb86a16_set_fe() error: uninitialized symbol 'VIRM'.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/dvb-frontends/mb86a16.c

@@ -635,6 +635,7 @@ static int sync_chk(struct mb86a16_state *state,
 	return sync;
 err:
 	dprintk(verbose, MB86A16_ERROR, 1, "I2C transfer error");
+	*VIRM = 0;
 	return -EREMOTEIO;
 
 }