btrfs-progs: from troubleshooting point of view messages must be unique

-----
cmds-device.c:                  fprintf(stderr, "ERROR: unable to scan the device '%s' - %s\n",
utils.c:                fprintf(stderr, "ERROR: unable to scan the device '%s' - %s\n",
-----

Signed-off-by: Anand Jain <anand.jain@oracle.com>

utils.c

@@ -945,7 +945,7 @@ void btrfs_register_one_device(char *fname)
 	ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
 	e = errno;
 	if(ret<0){
-		fprintf(stderr, "ERROR: unable to scan the device '%s' - %s\n",
+		fprintf(stderr, "ERROR: device scan failed '%s' - %s\n",
 			fname, strerror(e));
 	}
 	close(fd);