Fix missing break

Bug introduced with addition of internal error default case.
Seem like this code is not used.
TODO: add coverage test.

WHATS_NEW

@@ -1,5 +1,6 @@
 Version 2.02.94 - 
 ====================================
+  Fix missing break in _format_pvsegs (2.02.92).
   Test seg pointer for non-null it in raid_target_percent error path.
   Check for errors in _init_tags() during config loading.
   Always check result of _set_vg_name() in lvcreate.

lib/metadata/lv.c

@@ -53,6 +53,7 @@ static char *_format_pvsegs(struct dm_pool *mem, const struct lv_segment *seg,
 		case AREA_UNASSIGNED:
 			name = "unassigned";
 			extent = 0;
+			break;
 		default:
 			log_error(INTERNAL_ERROR "Unknown area segtype.");
 			return NULL;