media: dvb: Use int type to store negative error codes

Change the 'ret' variable from u8/u32 to int to store zero or negative
error codes returned by other functions.

Storing the negative error codes in unsigned type, doesn't cause an issue
at runtime but it's ugly as pants.

No effect on runtime.

Signed-off-by: Qianfeng Rong <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

drivers/media/dvb-frontends/cxd2841er.c

···
 {
 	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 	struct cxd2841er_priv *priv = fe->demodulator_priv;
-	u32 ret, bit_error = 0, bit_count = 0;
+	u32 bit_error = 0, bit_count = 0;
+	int ret;
 
 	dev_dbg(&priv->i2c->dev, "%s()\n", __func__);
 	switch (p->delivery_system) {

drivers/media/dvb-frontends/lgdt330x.c

···
 /* Software reset */
 static int lgdt3302_sw_reset(struct lgdt330x_state *state)
 {
-	u8 ret;
 	u8 reset[] = {
 		IRQ_MASK,
 		/*
···
 		 */
 		0x00
 	};
+	int ret;
 
 	ret = i2c_write_demod_bytes(state,
 				    reset, sizeof(reset));
···
 
 static int lgdt3303_sw_reset(struct lgdt330x_state *state)
 {
-	u8 ret;
 	u8 reset[] = {
 		0x02,
 		0x00 /* bit 0 is active low software reset */
 	};
+	int ret;
 
 	ret = i2c_write_demod_bytes(state,
 				    reset, sizeof(reset));