usbip: tools usbip_attach: Fix cryptic error messages

Attach device error message is cryptic and useless. Fix it to be
informative.

Signed-off-by: Shuah Khan <[e-mail]>
Reviewed-by: Krzysztof Opasiak <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

tools/usb/usbip/src/usbip_attach.c

···
 
 	rhport = query_import_device(sockfd, busid);
 	if (rhport < 0) {
-		err("query");
+		err("Attach request for Device %s. Is this device exported?",
+		    busid);
 		return -1;
 	}