dm space map metadata: limit errors in sm_metadata_new_block

The "unable to allocate new metadata block" error can be a particularly
verbose error if there is a systemic issue with the metadata device.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Joe Thornber <ejt@redhat.com>
diff --git a/drivers/md/persistent-data/dm-space-map-metadata.c b/drivers/md/persistent-data/dm-space-map-metadata.c
index 58fc1ee..e930844 100644
--- a/drivers/md/persistent-data/dm-space-map-metadata.c
+++ b/drivers/md/persistent-data/dm-space-map-metadata.c
@@ -385,13 +385,13 @@
 
 	int r = sm_metadata_new_block_(sm, b);
 	if (r) {
-		DMERR("unable to allocate new metadata block");
+		DMERR_LIMIT("unable to allocate new metadata block");
 		return r;
 	}
 
 	r = sm_metadata_get_nr_free(sm, &count);
 	if (r) {
-		DMERR("couldn't get free block count");
+		DMERR_LIMIT("couldn't get free block count");
 		return r;
 	}