btrfs-progs: convert strerror to implicit %m

Similar to the changes where strerror(errno) was converted, continue
with the remaining cases where the argument was stored in another
variable.

The savings in object size are about 4500 bytes:

 $ size btrfs.old btrfs.new
   text    data     bss     dec     hex filename
 805055   24248   19748  849051   cf49b btrfs.old
 804527   24248   19748  848523   cf28b btrfs.new

Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/qgroup.c b/qgroup.c
index 2cfd6dbd..a035579e 100644
--- a/qgroup.c
+++ b/qgroup.c
@@ -610,8 +610,9 @@ static struct btrfs_qgroup *get_or_add_qgroup(
 
 	ret = qgroup_tree_insert(qgroup_lookup, bq);
 	if (ret) {
-		error("failed to insert %llu into tree: %s",
-		       (unsigned long long)bq->qgroupid, strerror(-ret));
+		errno = -ret;
+		error("failed to insert %llu into tree: %m",
+		       (unsigned long long)bq->qgroupid);
 		free(bq);
 		return ERR_PTR(ret);
 	}