V4L/DVB (13018): kzalloc failure ignored in au8522_probe()

Prevent NULL dereference if kzalloc() fails.

Cc: Devin Heitmueller <dheitmueller@linuxtv.org>
Signed-off-by: NRoel Kluin <roel.kluin@gmail.com>
Signed-off-by: NDouglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/frontends/au8522_decoder.c

@@ -792,6 +792,11 @@ static int au8522_probe(struct i2c_client *client,
 	}
 
 	demod_config = kzalloc(sizeof(struct au8522_config), GFP_KERNEL);
+	if (demod_config == NULL) {
+		if (instance == 1)
+			kfree(state);
+		return -ENOMEM;
+	}
 	demod_config->demod_address = 0x8e >> 1;
 
 	state->config = demod_config;