usbip: tools usbip_attach: Fix cryptic error messages

Attach device error message is cryptic and useless. Fix it to be
informative.
Signed-off-by: NShuah Khan <shuahkh@osg.samsung.com>
Reviewed-by: NKrzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

tools/usb/usbip/src/usbip_attach.c

@@ -195,7 +195,8 @@ static int attach_device(char *host, char *busid)
 
 	rhport = query_import_device(sockfd, busid);
 	if (rhport < 0) {
-		err("query");
+		err("Attach request for Device %s. Is this device exported?",
+		    busid);
 		return -1;
 	}