[media] dib0700: correct error message

The goal of this patch is to correct a previous patch. In case of error,
the err() function should be used instead of dprintk() function.

[mchehab@redhat.com: as I've replaced dprintk by deb_info, on the the
 previous patch, to avoid breaking bisect, I had to fix a merge conflict
 on this one]
Signed-off-by: Olivier Grenie <olivier.grenie@dibcom.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/dvb-usb/dib0700_core.c

@@ -31,7 +31,7 @@ int dib0700_get_version(struct dvb_usb_device *d, u32 *hwversion,
 	int ret;
 
 	if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
-		deb_info("could not acquire lock");
+		err("could not acquire lock");
 		return 0;
 	}
 
@@ -117,7 +117,7 @@ int dib0700_set_gpio(struct dvb_usb_device *d, enum dib07x0_gpios gpio, u8 gpio_
 	int ret;
 
 	if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
-		deb_info("could not acquire lock");
+		err("could not acquire lock");
 		return 0;
 	}
 
@@ -138,7 +138,7 @@ static int dib0700_set_usb_xfer_len(struct dvb_usb_device *d, u16 nb_ts_packets)
 
 	if (st->fw_version >= 0x10201) {
 		if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
-			deb_info("could not acquire lock");
+			err("could not acquire lock");
 			return 0;
 		}
 
@@ -227,7 +227,7 @@ static int dib0700_i2c_xfer_new(struct i2c_adapter *adap, struct i2c_msg *msg,
 		} else {
 			/* Write request */
 			if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
-				deb_info("could not acquire lock");
+				err("could not acquire lock");
 				return 0;
 			}
 			st->buf[0] = REQUEST_NEW_I2C_WRITE;
@@ -273,7 +273,7 @@ static int dib0700_i2c_xfer_legacy(struct i2c_adapter *adap,
 	if (mutex_lock_interruptible(&d->i2c_mutex) < 0)
 		return -EAGAIN;
 	if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
-		deb_info("could not acquire lock");
+		err("could not acquire lock");
 		return 0;
 	}
 
@@ -368,7 +368,7 @@ static int dib0700_set_clock(struct dvb_usb_device *d, u8 en_pll,
 	int ret;
 
 	if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
-		deb_info("could not acquire lock");
+		err("could not acquire lock");
 		return 0;
 	}
 
@@ -400,7 +400,7 @@ int dib0700_set_i2c_speed(struct dvb_usb_device *d, u16 scl_kHz)
 		return -EINVAL;
 
 	if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
-		deb_info("could not acquire lock");
+		err("could not acquire lock");
 		return 0;
 	}
 
@@ -560,7 +560,7 @@ int dib0700_streaming_ctrl(struct dvb_usb_adapter *adap, int onoff)
 	}
 
 	if (mutex_lock_interruptible(&adap->dev->usb_mutex) < 0) {
-		deb_info("could not acquire lock");
+		err("could not acquire lock");
 		return 0;
 	}
 
@@ -610,7 +610,7 @@ int dib0700_change_protocol(struct rc_dev *rc, u64 rc_type)
 	int new_proto, ret;
 
 	if (mutex_lock_interruptible(&d->usb_mutex) < 0) {
-		deb_info("could not acquire lock");
+		err("could not acquire lock");
 		return 0;
 	}