gigaset: use dev_ macros for messages

The info() / warn() / err() macros from usb.h for generating kernel
messages are considered inferior to dev_info() / dev_warn() / dev_err()
from device.h.  Replace them where possible.  Also correct the severity
level and improve the text of one message.

Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/isdn/gigaset/asyncdata.c

@@ -575,7 +575,8 @@ int gigaset_m10x_send_skb(struct bc_state *bcs, struct sk_buff *skb)
 	else
 		skb = iraw_encode(skb, HW_HDR_LEN, 0);
 	if (!skb) {
-		err("unable to allocate memory for encoding!\n");
+		dev_err(bcs->cs->dev,
+			"unable to allocate memory for encoding!\n");
 		return -ENOMEM;
 	}