USB: serial: remove redundant OOM messages

Remove redundant error messages on allocation failures, which have
already been logged.

Cc: Joe Perches <joe@perches.com>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index de958c5..a9eb6221 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -497,14 +497,12 @@
 
 	buffer = kmalloc(writesize, GFP_ATOMIC);
 	if (!buffer) {
-		dev_err(&port->dev, "out of memory\n");
 		retval = -ENOMEM;
 		goto error_no_buffer;
 	}
 
 	urb = usb_alloc_urb(0, GFP_ATOMIC);
 	if (!urb) {
-		dev_err(&port->dev, "no more free urbs\n");
 		retval = -ENOMEM;
 		goto error_no_urb;
 	}
@@ -736,11 +734,8 @@
 		return NULL;
 
 	urb = usb_alloc_urb(0, mem_flags);
-	if (urb == NULL) {
-		dev_dbg(&serial->dev->dev, "%s: alloc for endpoint %d failed\n",
-			__func__, endpoint);
+	if (!urb)
 		return NULL;
-	}
 
 	buf = kmalloc(len, mem_flags);
 	if (buf) {
@@ -752,9 +747,6 @@
 		dev_dbg(&serial->dev->dev, "%s %c u : %p d:%p\n", __func__,
 				dir == USB_DIR_IN ? 'i' : 'o', urb, buf);
 	} else {
-		dev_dbg(&serial->dev->dev, "%s %c u:%p d:%p\n", __func__,
-				dir == USB_DIR_IN ? 'i' : 'o', urb, buf);
-
 		sierra_release_urb(urb);
 		urb = NULL;
 	}