btrfs-progs: do not output extra lines about mismatching device numbers

[BUG]
Fstests btrfs/218 fails with newer btrfs-progs:

btrfs/218 2s ... - output mismatch (see /home/adam/xfstests-dev/results//btrfs/218.out.bad)
    --- tests/btrfs/218.out	2024-11-24 18:04:01.137258508 +1030
    +++ /home/adam/xfstests-dev/results//btrfs/218.out.bad	2025-11-27 20:19:21.653781264 +1030
    @@ -2,6 +2,7 @@
     Label: none  uuid: <UUID>
     	Total devices <NUM> FS bytes used <SIZE>
     	devid <DEVID> size <SIZE> used <SIZE> path SCRATCH_DEV
    +found more devices than fs_info
     [SCRATCH_DEV].write_io_errs    0
     [SCRATCH_DEV].read_io_errs     0
     [SCRATCH_DEV].flush_io_errs    0
    ...
    (Run 'diff -u /home/adam/xfstests-dev/tests/btrfs/218.out /home/adam/xfstests-dev/results//btrfs/218.out.bad'  to see the entire diff)

[CAUSE]
Commit f1115bd ("btrfs-progs: count devices without SEARCH_TREE
ioctl in get_fs_info()") added a new message which will be triggered
every time we're calling get_fs_info() on a fs with a seed device.

This message is not really necessary as we know this behavior already
and is doing device number counting to handle such situation.

[FIX]
Just remove the unnecessary message which is confusing and lead to the
above golden output mismatch.

Fixes: f1115bd ("btrfs-progs: count devices without SEARCH_TREE ioctl in get_fs_info()")
Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Qu Wenruo <wqu@suse.com>

Author: adam900710

common/utils.c

@@ -208,10 +208,8 @@ int get_fs_info(const char *path, struct btrfs_ioctl_fs_info_args *fi_args,
 			if (ret == 0)
 				count++;
 		}
-		if (count > fi_args->num_devices) {
-			printf("found more devices than fs_info\n");
+		if (count > fi_args->num_devices)
 			fi_args->num_devices = count;
-		}
 
 		/* We did not count devid 0, do another probe. */
 		ret = device_get_info(fd, 0, &tmp);