Print full path in the error message. It's possible that fts(3)

provides an empty fts_name and reporting the full path is more
appropriate especially with the -R option.

PR:		bin/107515
Submitted by:	bde
Approved by:	trasz (mentor)
MFC after:	1 week

bin/ls/ls.c

@@ -508,7 +508,7 @@ traverse(int argc, char *argv[], int options)
 			break;
 		case FTS_DNR:
 		case FTS_ERR:
-			warnx("%s: %s", p->fts_name, strerror(p->fts_errno));
+			warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
 			rval = 1;
 			break;
 		case FTS_D: