btrfs-progs: find-root: Output matched root when searching all roots

btrfs-progs: find-root: Output matched root when searching all roots

[Bug]
When given '-a' option, btrfs-find-root will output all possible tree
roots but the exact matched one.

[Reason]
Result printing skipes the exact match one, as it will normally be shown
before the alternative ones.
But when '-a' is given, that's not the case.

[Fix]
Just show the exact match one for search all case.

Reported-by: Marc Merlin <marc@merlins.org>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>