===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/less/os.c,v
retrieving revision 1.16
retrieving revision 1.17
diff -u -r1.16 -r1.17
--- src/usr.bin/less/os.c	2016/03/16 15:36:26	1.16
+++ src/usr.bin/less/os.c	2019/06/28 13:35:01	1.17
@@ -40,7 +40,7 @@
 start:
 	flush(0);
 	n = read(fd, buf, len);
-	if (n < 0) {
+	if (n == -1) {
 		/*
 		 * Certain values of errno indicate we should just retry the
 		 * read.